There's an infinite list of pairs of numbers that can do that.
If you only want whole numbers, then you're stuck with only these:
1 x 18,
2 x 9, and
3 x 6
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If you meant what whole numbers can you use to multiply to 18, there's 9x2, 6x3, and of course 1x18 but you could multiply any number[s] to 18
20
143
189
-17