In the sub Rs 20,000 price bracket, you can get very serious hardware including 4 GB RAM, huge 6000 mAh batteries, gorgeous glass body or phones with metal unibody. Almost all brands offer their phones in this price segment.
Asus Zenfone 2 (4GB RAM) – Rs 19,999
There is no beating around the bush with this phone; the Asus Zenfone 2 finds itself in this list thanks to its massive 4 GB of RAM. The phone is a wonderful all-rounder that misses next to nothing (except for a fingerprint sensor). It is equipped with a 5.5 inch display with Resolution of 1920 x 1080 pixels (full HD). The Android Lollipop based Asus Zenfone 2 has a 2.3 GHz quad-core Intel Atom Z3580 processor. The phone offers huge 64 GB of internal memory as well as a 64 GB microSD card slot.
The Asus Zenfone 2 has a 13 megapixel Autofocus primary camera which has support of real tone flash light. It has HD recording and a host of other features. For selfies, the phone offers a 5 megapixel front camera. The dual SIM Asus Zenfone 2 is compatible with 4G networks. It offers GPS, Bluetooth, NFC, WiFi and a 3000 mAh battery.
The OnePlus X is another most noted device in the price segment. Not only it has a gorgeous glass unibody but it also comes with the high end Snapdragon 801 quad core processor which runs at 2.3 Ghz. There is 3 GB RAM in the phone that has 16 GB of internal memory as well as a 128 GB micro SD card slot. The OnePlus X offers a 13 megapixel primary camera and an 8 megapixel rear camera. The OnePlus X has Dual-SIM slot (hybrid) and is compatible with 4G networks. Besides, it has GPS (A-GPS, GLONASS, Beidou), Bluetooth, WiFi and a 2525 mAh battery.
To read OnePlus X’s review, click here.
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With a huge 4900 mAh battery, the Lenovo Vibe P1 is an irresistible smartphone in the price bracket. With this battery, it claims to offer 44 hours of talktime and 600 hours of standby on 3G network. Besides, it comes with Quick Charging feature and a 24W charger that claims to charge the phone in just 60 minutes.
Besides, the Vibe P1 has a 5.5 full inch HD IPS display, Android Lollipop operating system, an octa-core 1.5 GHz processor and 2 GB of RAM. The internal memory stands at 32 GB to which you can add another 128 GB via a microSD card. It too comes with a 13 megapixel auto focus rear camera and a 5 megapixel selfie shooter. The dual-SIM Lenovo Vibe P1 also offers 4G, GPS (A-GPS), WiFi, NFC, and Bluetooth for connectivity.
The Motorola Moto G Turbo is equipped with a 5 inch HD IPS display. The phone runs on Android Lollipop with an octa-core 1.5 GHz processor and 2 GB of RAM. Its internal memory stands at 16 GB to which you can add another 32 GB via a microSD card. 
There is a 13 megapixel camera in its rear panel that has Aperture of f/2.0, Field of view of 76 degrees, dual-LED flash, Auto focus, Quick Capture, and video stabilisation features. In its front lies a 5 megapixel selfie shooter with an aperture of f/2.2. The dual-SIM Motorola Moto G Turbo is a 4G phone with GPS (A-GPS and GLONASS), WiFi, and Bluetooth for connectivity. Its 2470 mAh power unit can provide up to 24 hours of mixed usage, and can give up to 6 hours of power in 15 minutes.
Xolo Black (3GB RAM) – Rs 11,999
The Xolo Black (3GB) is armed with a 5.5 inch full HD IPS display. It runs on Android Lollipop, and has an octa-core processor clocked at 1.5 GHz, which runs with 3 GB of RAM. The internal memory of the Xolo Black stands at 16 GB to which you can add another 32 GB via a microSD card. 
The rear has a dual camera set up, with a 13 and 2 megapixel combination; while the front of the phone has a 5 megapixel selfie taker. The Xolo Black is a dual-SIM phone with 4G, GPS (A-GPS), Bluetooth, and WiFi. The power is provided by a 3200 mAh battery.