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What number between one and 20 has exactly 5 factors
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What number between one and 20 has exactly 5 factors

User Chris Culter
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1,2,4,8,16, these are the factors
your answer is 16
User AndrewG
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Interesting factoid: Only perfect squares have an odd number of factors. So we know to try 4, 9, and 16, and ignore the rest. It's 16, whose factors are 1, 2, 4, 8, and. 16 .
User Donoven Rally
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