We generally don't consider negative factors of positive numbers. The negative factors of -500 are a duplicate set of the set of positive factors -- just with minus signs.
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One and negative one.
As a product of its prime factors in exponents: 22*53 = 500
The GCF is 5.
The Greatest Common Factor (GCF) is: 20.
The greatest common factor (GCF) is: 20