Greetings dear aspirant

Harcourt Butler Technical University, Kanpur (HBTU) is one of the oldest engineering colleges in India and it offers admission in undergraduate courses on the basis of JEE Mains rank.
Now, as you have secured 20,000 EWS rank in JEE mains 2020, then there is no chance that you can get HBTU Kanpur.
Because as per your EWS category rank, your CRL rank must be above 100000 and with this much CRL rank you can't get even the lowest branch of HBTU Kanpur.

Here are the last year final round's cutoff closing ranks for EWS candidates on the basis of their CRL rank :-

Bio-chemical Engineering - 67751
Chemical Engineering - 48743
Civil Engineering - 48795
Computer Science and Engineering - 31227
Electrical Engineering - 44726
Electronics Engineering - 41683
Food Technology - 73561
Information Technology - 32958
Leather Technology - 74105
Mechanical Engineering - 46377
Oil Technology - 65799
Paint Technology - 64325
Plastic Technology - 68990

So as you can see there is no chance for you to get the lowest branch of HBTU Kanpur from your EWS category, even if you belong from home state up.

Also check out our JEE Mains college predictor tool to get an appropriate idea of colleges that you can get on basis of your jee mains rank :-
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer