The composite numbers up to 20 are 4,6,8,9,12,14,15,16,18 and 20.
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Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The composite numbers in that range are 10, 12, 14, 15, 16, 18, 20. I don't know if you're including 10 and 20 or not. Add them up however you like.
The composite numbers between 20 and 30 are: 20 21 22 24 25 26 27 28 30
The composite numbers from 2 to 20 are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, and 20.
The composite numbers between 20 and 30 are 21, 22, 24, 25, 26, 27, and 28.