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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.

Q: What is the lowest common factor for 5 and 20?

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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

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It is: 1

The lowest common factor of any number is 1

The lowest common factor of any two numbers is 1. The highest common factor of 5 and 35 is 5; The Lowest common multiple of 5 and 35 is 35.

The lowest common factor is: 1

The least common factor of any set of integers is 1.

The lowest common factor of any set of integers is 1.

5* * * * *A pedantic amendment:5 is the Highest common factor. The lowest common factor for any set of postitive integers is always 1.

Since 5 is a factor of 20, all the factors of 5 are common to 20.

The lowest common factor of two or more numbers will always be 1.

The lowest common factor of any set of positive integers is 1.

20.20The LCM of 4 and 5 is 20.

1, but if you meant lowest common multiple, then 35