With a JEE Main rank around 20,799, as a girl, you have a good chance to get admission in some IIITs (Indian Institutes of Information Technology) for CSE or AI branches. IIIT Hyderabad and IIIT Bangalore might be tough, but IIITs like IIIT Pune, IIIT Hyderabad (if waitlist), IIIT Guwahati, and other newer IIITs are possible. Also, some IIITs give relaxation or reservations for female candidates, so your chances improve. Participate in counseling and check cutoffs carefully.