1, 3, 7, 21.
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The GCF is 21.
These numbers divide 20 equally: 1, 2, 4, 5, 10, 20.
21,42,64,86,108,130,152,174,196,218They are 21, 42, 63, 84, 105, 126, 147, 168, 189, 210.
The GCF is 21.
21, 42, 63, 84, 105, 126, 147, 168, 189, 210.