The factors of 9 are 1, 3, 9
The factors of 16 are 1, 2, 4, 8, 16
The common factor of 9 and 16 is 1
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The factors of 16 are 2, 4 and 8. The factors of 36 are 2, 4, 9, 12 and 18. The common factors are therefore 2 and 4. The common prime factor is 2.
factor OS 63 63 - 1, 3, 7, 9, 21, 63 7 and 9 add up to 16 7+9=16
The factors of 32 are: 1, 2, 4, 8, 16, 32. The factors of 81 are: 1, 3, 9, 27, 81.
12, 14, and 20 have an even number of factors. 4, 9, and 16 also have an even number of factors, but since they're perfect squares, two of the factors are the same number in each case, so each appears to have an odd number of factors.
Square numbers have odd numbers of factors. Examples: 4, 9, 16