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# What numbers between 1and 20 only have 2 factors?

Updated: 4/28/2022

Wiki User

8y ago

The prime numbers: 2, 3, 5, 7, 11, 13, 17 and 19.

Wiki User

8y ago

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Q: What numbers between 1and 20 only have 2 factors?
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### Why are the numbers between 1 and 50 prime?

Because the prime numbers between 1and 50 only have exactly 2 unique factors.

### What are the factors of 1and 4?

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All prime numbers have only two factors, one and themselves.

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Numbers having only 2 factors are prime numbers. Their only factors are 1 and themselves. Prime numbers. The only two factors should be 1 and itself.

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