Common factors of 20 and 28: 1, 2, and 4.
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The factors of 20 are 1, 2, 4, 5, 10, and 20 The factors of 28 are 1, 2, 4, 7, 14, and 28. Common factors of 20 and 28: 1, 2, and 4.
The common factors of 28 and 84 are 1,2,4,7,14 and 28.
The common factors of 28 and 84 are 1,2,4,7,14 and 28
The common factors of 28 and 63 are: 1 and 7
The common factors of 28 and 49 are 1 and 7.