abundant number

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abundant number (plural abundant numbers)

  1. (number theory) A number that is less than the sum of all of its divisors except itself.
    The factors of 30 are 1, 2, 3, 5, 6, 10, 15 and 30, and 1 + 2 + 3 + 5 + 6 + 10 + 15 = 42, which is greater than 30, so 30 is an abundant number.

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