5, because since 5 is a Prime number (meaning it has only two factors, 1 and 5) its largest factor period is itself. 1 and 5 both go into 20 evenly, so the LCF is 5.
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The least common factor of any set of integers is 1.
The lowest common factor of any set of positive integers is 1.
The lowest common factor of any set of integers is 1.
The least common factor of any set of integers is 1.
The Greatest Common Factor of 20, 35, 50: 5