There are an infinite number of them. Every number between zero and 20
goes into 20 at least once. That includes every fraction and decimal that's
less than 20.
-20, -10, -5, -4, -2, -1, 1, 2, 4, 5, 10, and 20 go into it with no remainder.
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A single number, 20, does not have a lowest common multiple! So there are no two numbers to go in.
The two whole numbers that go into 40 evenly are 1, 2, 4, 5, 8, 10, 20, and 40.
1 and 20.
20 and -20
20 and 40