1, 2, 3, 5, 6, 10 and 15.
Some people do not consider 1 to be a proper factor.
Chat with our AI personalities
The proper factors of 220 are 2,4,5,10,11,20,22,44,55,110
1, 5, 7, and 35 are the factors of 35. The proper factors are 5 and 7.
47 is a prime, so its only factors are 1 and 47. Prime numbers don't have "proper" factors.
The sum of the positive whole-number factors of 30 is 72.
Abundant is a number for which the sum of all its proper factors is greater than the number itself. Deficient is a number for which the sum of all its proper factors is less than the number itself. Perfect is a number for which the sum of all its proper factors is the number itself.