Least common factor is always 1. If you meant least common multiple, it would be 140. If you meant greatestcommon factor, it would be 4.
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The least common factor is 1. (The least common factor of any two or more positive integers is always 1.)
The greatest common factor can't be a smaller number than the least common factor, but if you meant least common multiple, 7 and 28 have a GCF of 7 and an LCM of 28.
The least common factor of 8 and 28 is 2.
The greatest common factor of 20, 28, and 24 is 4.
28 and 28
The least common factor of any set of integers is 1.