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

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

The factors of 3 are 1 and 3.

Common factors have to go into both numbers. The only common factor of 20 and 27 is 1.

As factors, 1, 2, 4, 5, 10, 20

Three numbers.

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1, 2, 4, 5, 10, 20

12 and 18

Just 16.

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

Any numbers between 1 and 100 can be common factors, but in order for them to be common factors, you have to have two numbers. For example, 40 and 78:The factors of 40 are 1, 2, 4, 5, 8, 10, 20, 40.The factors of 78 are 1, 2, 39, 78.The common factors are 1 and 2.

The square numbers between 1 and 20 are 1,4,9 and 16.

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

24 it has 1, 2, 3, 4, 6, 8, 12, and 24... that's 8 numbers.

1 and 4

As factors, 1 and 5

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

There are 11 numbers between 1 and 130 that have an odd number of factors: 1,4,9,16,25,36,49,64,81,100,121.

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