4,6,8,9,10,12,14,15,16,18,20...
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Six.
20 and 40 have 4 and 5 as common factors.
Composite numbers are those numbers which have more than 2 factors. Example: 4 has more than 2 factors (factors of 4 are- 1, 2 and 4) and hence is a composite number. Other examples are 6, 8, 9, 10, 12 etc.
The numbers are: 8 16 and 24
Square numbers have odd numbers of factors. Examples: 4, 9, 16