Least common FACTOR would be 2. LCM would be 80.
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The least common factor is 1 but the highest common factor is 4
The least common factor of any set of integers is 1.
The least common factor is 1. (The least common factor of any two or more positive integers is always 1.)
The lowest common multiple of 16 and 20 is 80.
Least common multiple of 16 and 20 and 32 is 160.