The numbers 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39 and 40 are composite (including the boundaries).
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1, 2, 4, 5, 8, 10, 20, 40
1,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39 are the composite numbers between 1 and 40.
The composite numbers up to 20 are 4,6,8,9,12,14,15,16,18 and 20.
Not all numbers between 20 and 28 are composite numbers. 23 is a prime number.
The composite factors of 120 are 4, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120