All of them except 23 and 29 which are prime numbers
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Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The composite numbers between 20 and 30 are 21, 22, 24, 25, 26, 27, and 28.
All of them except 23 and 29 which are prime numbers
The sum is 75.
The composite numbers between 20 and 25 are 21, 22, and 24. 23 is the only prime number between 20 and 25.