It is 10 whose factors are: 1, 2, 5 and 10
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20 and 28 both have six factors.
15 Factors of 15: 1, 3, 5, 15 15 = 1 x 15 15 = 3 x 5
5, 10, 15 and 20 have five as a factor. The number 16 has five factors.
20 is a composite number because it has more than 2 factors
Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.Any number that has factors smaller than itself (other than 1) is a composite number.