56
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The highest factor of any number is the number itself. The GCF of 20 and 50 is 10.
No multiple of 86 is in that range. 43 is a prime number that is a factor of 86.
5
1, 2, 5, 10, 25, 50
The highest factor of any number is the number itself. The GCF of 20 and 50 is 10.