Ah probably, if the error you receive is a timeout after 12 seconds, then that means you have to optimize your code. Hint: to calculate the sum of all proper divisors of a number n, you don't need to test every number up until n / 2.

If you post your code, make sure you mark your post as having spoiler content.

There shouldn't be a main in your code, and check if your function names are the same as in the base skeleton code (this is important because the unit tests are calling those function names).