The answer is 5.
1,2,4,8,16
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The common factors of 12 and 16 are 1, 2 and 4.
1, 16 , 4 ,4 , 8 , 2
The factors of 16 are: 1, 2, 4, 8, 16The factors of 18 are: 1, 2, 3, 6, 9, 18
The factors of 32 are 1, 2, 4, 8, 16, 32. And they all (except 1) factor to 2.
A factor is what a number is divisible by. 16: 1, 2, 4, 8, 16