You need at least two numbers to find something in common between them, but I'll save you the trouble. The least common factor of any set of positive integers is 1.
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It is not possible to give a sensible answer to this question. A common factor refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
The greatest common factor of 156 , 40 = 4
The least common multiple of 180 and 156 is 2340. The greatest common factor is 12.
12
The GCF is 13.It is: 13
17.