Quasiperfect 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

Definition

A quasiperfect number is a natural number that is the sum of all its proper nontrivial divisors. In other words, it is a natural number such that .

Relation with other properties

Weaker properties