Deficient number

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This article defines a property that can be evaluated for a natural number, i.e., every natural number either satisfies the property or does not satisfy the property.
View a complete list of properties of natural numbers


A natural number is termed a deficient number if , where denotes the divisor sum function. In other words, is greater than the sum of all its proper positive divisors.

Relation with other properties

Opposite properties

Stronger properties