Cody Problems 1933 and 46898 deal with sigma(n), the sum of divisors function. This problem deals with sigma*(n), the sum of unitary divisors functions. Unitary divisors are defined in Cody Problem 56738, which asks for a list of the unitary divisors of a number, and they appear in Cody Problem 56743, which asks for a count.
Write a function to sum the unitary divisors of a number. For example, the unitary divisors of 18 are 1, 2, 9, and 18; therefore, the sum is 30.
Solve

Solution Stats

11 Solutions

10 Solvers

Last Solution submitted on Dec 07, 2025

Last 200 Solutions

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers10

Augusto Mazzei CXD GeeTwo Hong Son

Suggested Problems

More from this Author321

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!