What the technical term for factors of a number (via summation)?

Question

I know that 5 and 3 are factors of 15. Here factors are numbers whose multiplication gives 15.

What is the technical term for numbers whose sum (and not multiplication) is a given value?

i.e. technical term for following numbers

14 - 1 (sum is 15)

11 - 2 - 2 (sum is 15)

1 - 1 - 1 - 1 - 1 - 1 .. 15times (sum is 15)

Answer 1

These are called the partitions of a number.