Hello, 

According to general merit cutoffs of COMEDK in year 2018, with a rank of 20689, you can get CSE at Bangalore Technological Institute, Cambridge Institute of Technology, Dayanand Sagar University. You can have a seat in ECE at B.N.M. Institute of Technology, B.M.S. Institute of technology and management. Please note this prediction has been made by previous year cutoffs. Cutoffs can vary too based on factors like number of students appearing, number of seats available, difficulty level of the paper etc. 

I hope this helps. For further queries, ask me in the comments.