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# What is a number less than 20 and has 3 factors?

Updated: 9/21/2023

Wiki User

12y ago

4 and 9.

Factors of numbers come in pairs which means that every number ought to have an even number of factors.

To have an odd number of factors, one factor pair must be a repeated number which means that only square numbers have an odd number of factors.

The square numbers less than 20 are 1, 4, 9 & 16 and of these 4 & 9 have 3 factors:

4: 1, 2 & 4

9: 1, 3 & 9

Wiki User

12y ago

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Q: What is a number less than 20 and has 3 factors?
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