Last Updated：2022/12/23
The abundancy index of 20 is 2.1 because 1 + 2 + 4 + 5 + 10 + 20 = 42 and 42/20 = 2.1.
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The abundancy index of 20 is 2.1 because 1 + 2 + 4 + 5 + 10 + 20 = 42 and 42/20 = 2.1.
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