2 x 2 x 5 = 20
2 x 2 x 2 x 2 x 2 = 32
2 x 2 = 4, the GCF
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That is not what prime factorization is for.
Whatever you use, you need at least two numbers to find a GCF.
It is: 4
It is: 1
You need at least two numbers to find a GCF.