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What is the term for equal to the sum of its proper factors?
A perfect number is the term for a number that is equal to the sum of its proper divisors. Be careful not to confuse that with proper factors. Proper divisors include 1 but not the number itself. Proper factors don't include either I or the original number.
What is the sum of the proper factors of 256?
154 is the sum of the proper factors of 256.
What number between 20 and 30 has a sum of all its proper factors equal to twice the number itself?
There aren't any numbers like that. You might be thinking of 28, which has a sum of all its factors equal to twice itself, making it a perfect number. Proper factors are a different set.
What is the sum of the proper factors of 75?
48
What are the factors of -84 that equal the sum of -16?
The factors of -84 that equal the sum of -16 are: -28 and 12 -14 and -2 -12 and -4
What is the sum of all the proper factors of 1000?
2,340
What does Abundant Deficient and perfect mean?
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.
What is the sum of all its proper factors of 5?
Zero. 5 is a prime so its only factors are 1 and 5. It, therefore, has no proper factors.
What do you call a number that is equal to the sum of its factors?
amicable
What is a perfect number and give an example of one?
A perfect number is equal to the sum of its proper divisors (the factors excluding the number itself.) 6 is a perfect number. Its proper divisors are 1, 2 and 3.
What does abundant mean in proper factors?
an abundant number is less than the sum of its proper divisors
What factors of 945 equal the sum of 26?
21 and 5
