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40.828
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48.
1, 3, 5, 9, 15, 27, 45, 135 1, 3, 7, 9, 21, 27, 63, 189
The factors of 21 are: 1, 3, 7, 21.The factors of 27 are: 1, 3, 9, 27.The common factors are: 1, 3
27 + 540 = 567