Yes -20 is a whole number or an integer because it has no fractions or decimals with it.
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You do nothing. A negative number is a whole number.
6 is a whole number -47.03 is a negative number -179 is a negative whole number
If you mean -20 then it is an integer because it is a whole number
They can be. For example, -3 is a negative whole number.
The whole number factors of 20 are 1, 2, 4, 5, 10, and 20, and the negative of each of those.