Ten. Here they are: 4 6 8 9 10 12 14 15 16 18.
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10,12,14,15,16,18,20
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The composite numbers between 20 and 25 are 21, 22, and 24. 23 is the only prime number between 20 and 25.
The composite numbers between 20 and 30 are: 20 21 22 24 25 26 27 28 30
Composite numbers between 6 and 20 are 8, 9, 10, 12, 14, 15, 16, and 18.