With a EWS Rank of 20k, you wont secure a seat in any IIIT, neither at any NIT or GFTI. You should rather aim for State Engineering Counselling, if through JEE Main Scorecard, or apply to many Good Private Engineering Colleges accepting JEE Main Scorecard for Admission and Counselling.

For more information and College Prediction do follow the link below

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

For more information about Top Private Engineering Colleges accepting JEE Main Scorecard do follow the link below

https://engineering.careers360.com/colleges/list-of-private-engineering-colleges-in-india-accepting-jee-main