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2,3,5,7,11,13,17 &19 - they're all the prime numbers !

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They are the prime numbers of: 2 3 5 7 11 13 17 and 19

Such numbers are called prime numbers. They are 2, 3, 5, 7, 11, 13, 17, and 19.

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

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A number will always have 1 and itself as factors. And thus the only numbers with 2 factors will be prime numbers. The only prime numbers below 20 are 2, 3, 5, 7, 11, 13, 17 and 19, and thus these are the only numbers below 20 that have 2 factors.

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

They are all positive two-digit whole numbers between 15 and 65. As to factors, only 1.

They are prime numbers which are: 23 29 31 37 41 43 and 47

Prime numbers only have factors of 1 and themselves: 23, 29

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A number will always have 1 and itself as factors. And thus the only numbers with 2 factors will be prime numbers. The only prime numbers below 20 are 2, 3, 5, 7, 11, 13, 17 and 19, and thus these are the only numbers below 20 that have 2 factors.

All of them except 23 and 29 which are prime numbers having only two factors

They are the only ones with just two factors.

48

1 and 5 are the only numbers that are factors of 20, 35, and 45.

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

Prime numbers between the given numbers are 23 and 29

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

They are all positive two-digit whole numbers between 15 and 65. As to factors, only 1.

For a number to have [only] 2 factors, it must be a prime number; the prime numbers between 0 and 20 are; 2, 3, 5, 7, 11, 13, 17, 19

1, 2, 4, 5, 10, 20

They are prime numbers which are: 23 29 31 37 41 43 and 47