The factors of 132 are: 1, 2, 3, 4, 6, 11, 12, 22, 33, 44, 66, 132
The factors of 220 are: 1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220
The greatest common factor of 132 and 220 is 44.
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