There cannot be a greatest common factor (GCF) of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.
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The least common factor of any set of numbers is 1.
The greatest common factor of the numbers 2, 46 and 4 is 2.
The Least Common Multiple (LCM) for 122 46 is 2,806.
Least Common Multiple (LCM) for 46 3 is 138
The least common factor of any set of numbers is 1.