1, -1, 2, -2, 4, -4, 5, -5, 10, -10, 20, -20
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115
The factors of 20 are 1, 2, 4, 5, 10, and 20.1, 2, 4, 5, 10, 201, 2, 4, 5, 10, 20.Its factors are: 1 2 4 5 10 and 20
negative
If you are multiplying negative numbers, an odd number of factors will have a negative product. An even number of factors will have a positive product.
5, 10, and 20 are factors of 20 that are not also factors of 12.