Well, honey, the Greatest Common Factor (GCF) of 189 and 20 is 1. Those two numbers don't have any common factors other than 1. So, there you have it, the sassy truth!
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The GCF is 1
The GCF is 27.
The GCF is: 63
GCF(189, 441, 63) = 21.
The GCF is 21.