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Q: What is the sum of the divisors of 1211?

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Sum of divisors: 1728.

Sum of divisors: 980.

Sum of divisors = 91.

Sum of divisors of 130 = 252.

Sum of 150's divisors = 372.

Sum of 24's divisors: 60.

1, 2, 3, 4, 6, 8, 12, 24 (sum = 60)

The sum is 195.

2

A perfect number equals the sum of its proper divisors. A deficient number is greater than the sum of its proper divisors. An abundant number is less than the sum of its proper divisors. Proper divisors of a number do not include the number itself.

its 217

60

A perfect number is the sum of its divisors; for example 6 is a perfect number because the sum of its divisors is 6 (1 + 2 + 3). The sum of the divisors of 8 is 7 (1 + 2 + 4), so 8 is not a perfect number.

14 is deficient. It is less than the sum of it's divisors. In mathematics, a deficient number or defective number is a number n for which σ(n) < 2n. Here σ(n) is the sum-of-divisors function: the sum of all positive divisors of n, including n itself Proof.. divisors of 14 are 1,2, and 7 and 14. Now, 2n=28 and and the sum the all the divisors including 14 is 24<28

The sum of divisors of a number, excluding the number itself, is called its aliquot sum

99

15

Add them together.

1,815

lets see...prime factorization of 100, 2,2,5,5 so divisors are 2,4,10,20,25,50 so the sum is 111 unless you want to include 1 and 100 then the sum is 212

a perfect number is defined as a positive integer which is the sum of its proper positive divisors, that is, the sum of the positive divisors excluding the number itself 137,438,691,328 is the 7th perfect number.

Amicable numbers are pairs of numbers for which the sum of the proper divisors (the divisors except for the number itself) equals the other number in the pair. The smallest amicable pair is 220 and 284. The proper divisors of 220 are and the factors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55, and 110, the sum of which is 284. The proper divisors of 284 are 1, 2, 4, 71, and 142, the sum of which is 220.

Because the sum of its proper divisors is greater than 20.

Because 26 is greater than the sum of its proper divisors.

A practical number is one that is the sum of distinct proper divisors.