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Abundant Number (An)

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A number such that the sum of all its divisors (except itself) is greater than the number itself. Thus 12 is an abundant number, because its divisors, 1, 2, 3, 4, 6 = 16, which is greater than 12.

A Deficient number is one of which the sum of all its divisors is less than itself, as 10, the divisors of which are 1, 2, 5 = 8, which is less than 10.

A Perfect number is one of which the sum of all its divisors exactly measures itself, as 6, the divisors of which are 1, 2, 3 = 6.

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ABCDEFGHIJKLMNOPQRSTUVWXYZ

Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.

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Abscond
Absent
Absent Man (The)
Absolute
Absquatulate
Abstemious
Abstract Numbers
Abstraction
Absurd
Abudah
Abundant Number (An)
Abus
Abyla
Abyssinians
Acacetus
Academics
Academy
Academy Figures
Acadia—i.e.
Acadine
Acanthus