# Category:Abundancy

This category contains results about Abundancy.
Definitions specific to this category can be found in Definitions/Abundancy.

Let $n$ be a positive integer.

Let $\map \sigma n$ be the sigma function of $n$.

That is, let $\map \sigma n$ be the sum of all positive divisors of $n$.

Then the abundancy index of $n$ is defined as $\dfrac {\map \sigma n} n$.

## Subcategories

This category has the following 14 subcategories, out of 14 total.

## Pages in category "Abundancy"

The following 4 pages are in this category, out of 4 total.