4, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320
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4, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
Since 20 is a factor of 320, it is automatically the GCF.
17 has no composite factors.
The composite factors of 63 are 9, 21 and 63.