There are infinitely many answers.
Let A be any whole number and let B = -A -20
Then by the closure of integers, B must be a whole number.
And A + B = A + (-A - 20) = -20
Since A is arbitrary, there are infinitely many ways of choosing A and so there are infinitely many ways in which two whole numbers will make -20.
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Including 32 and 53 = 22 whole numbers in betweenNot including 32 and 53 = 20 whole numbers in between
The numbers are: -1 and -20
The numbers are: 20 and -48
-1597
The only two are 9 and 16.