The least common factor is a term often mistakenly given to either the greatest common factor (GCF) or the least common multiple (LCM). This term is not often used because it does not describe a useful relationship between numbers. Since 1 evenly divides all integers, 1 is technically the least common factor for any set of integers.
The smallest non-one common factor of 16 and 24 is 2.
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I think the you are looking for the greatest common factor of 16 and 24. If you really want the least common factor, it is 1 just like with any other number. The gratest common factor would be 8.
The least common factor is: 1
16 = 24 and 5 have no common factor so the LCM is 16x5=80
The least common factor of any set of numbers is 1.
The greatest common factor of the numbers 16 and 24 is 8.