All of them except for 29 and 31 which are prime numbers
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The composite numbers between 20 and 25 are 21, 22, and 24. 23 is the only prime number between 20 and 25.
12 is a composite number - one of 14 such numbers - between 1 and 25.
The composite numbers between 20 and 30 are 21, 22, 24, 25, 26, 27, and 28.
20, 21, 22, 24, 25
The composite numbers between 21 and 31 are: 21 22 24 25 26 27 28 30