Factors are numbers you can multiply together to get another number.
23: 1, 23
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The product of all the common prime factors is the GCF. The product of all common factors would vary according to the list.
45 has 6 factors: 1,3,5,9,15,45
1 and 2
The factors of 115 are: 1, 5, 23, 115
The factors of 65 are 1, 5, 13, 65.