As factors, 1 and 5
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20 and 40 have 4 and 5 as common factors.
5 and 10 5 and 15 5 and 20
1 and 20 is one possible pair.
The Least Common Multiple (LCM) for 5 20 is 20.
The least common multiple is the smallest number that is multiple of two or more numbers. The LCM of 2, 4, and 5 is 20.