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
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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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You can multiply the number 18 by different numbers that are relatively prime, for example by different prime numbers.
1,2,3,6,9 & 18 !