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The Greatest Common Factor (GCF) of 20, 28, and 36 is 4.
The factors of 20 are 1, 2, 4, 5, and 10.
Since ten is not a factor for either 28 or 36, we can remove it from consideration.
Five, likewise, is not a factor for either 28 or 36, so it can be removed as well.
This leaves four, which is the greatest common factor for all three numbers.
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