abundant number
Sign in to savenumber for which the sum of its proper divisors is greater than the number itself
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Demonstration, with Cuisenaire rods, of the abundance of the number 12
In number theory, an abundant number or excessive number is a positive integer for which the sum of its proper divisors is greater than the number. The integer 12 is the first abundant number. Its proper divisors are 1, 2, 3, 4 and 6 for a total of 16. The amount by which the sum exceeds the number is the abundance. The number 12 has an abundance of 4, for example.