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What number 1 to 20 has exactly 5 factors?
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What number 1 to 20 has exactly 5 factors?

User Chfw
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1 Answer

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the number 18 has 5 factors

9 times 2 is 18
2 times 9 is 18
1 times 18 is 18
6 times 3 is 18
3 times 6 is 18

the factors are 1, 2, 3, 6, and 9

the answer is 18
User Tianxiang
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