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

Q: What numbers between 1and 20 only have 2 factors?

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They are the numbers that have more than 2 factors in them because a prime number has only 2 factors which are itself and one

Prime numbers only have one and itself as factors.

Numbers that have only 2 factors are prime numbers

They all have only two factors: one and the number itself.

There are three numbers that fit those requirements.

Related questions

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

Only common is one only

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

They are the numbers that have more than two factors whereas prime numbers have only two factors

They are the numbers that have more than two factors in them whereas prime numbers have only two factors.

They are the numbers that have more than two factors whereas prime numbers have only two factors

They are the composite numbers that have more than two factors in them whereas prime numbers have only two factors in them

Only 1.

They are all the prime numbers from 2 to 97 that have only two factors

Because they are both prime numbers which means that they have only 2 factors

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.

In that range, only 100 has exactly 9 factors.