What are the divisors of 5716?

1, 2, 4, 1429, 2858, 5716

There is a total of 6 positive divisors.
The sum of these divisors is 10010.
The arithmetic mean is 1668.3333333333.

4 even divisors

2, 4, 2858, 5716

2 odd divisors

1, 1429

How to compute the divisors of 5716?

A number N is said to be divisible by a number M (with M non-zero) if, when we divide N by M, the remainder of the division is zero.

$N mod M = 0$

Brute force algorithm

We could start by using a brute-force method which would involve dividing 5716 by each of the numbers from 1 to 5716 to determine which ones have a remainder equal to 0.

$Remainder = N - (M \times ⌊ \frac{N}{M} ⌋)$

(where $⌊ \frac{N}{M} ⌋$ is the integer part of the quotient)

5716 / 1 = 5716 (the remainder is 0, so 1 is a divisor of 5716)
5716 / 2 = 2858 (the remainder is 0, so 2 is a divisor of 5716)
5716 / 3 = 1905.3333333333 (the remainder is 1, so 3 is not a divisor of 5716)
...
5716 / 5715 = 1.0001749781277 (the remainder is 1, so 5715 is not a divisor of 5716)
5716 / 5716 = 1 (the remainder is 0, so 5716 is a divisor of 5716)

Improved algorithm using square-root

However, there is another slightly better approach that reduces the number of iterations by testing only integers less than or equal to the square root of 5716 (i.e. 75.604232685743). Indeed, if a number N has a divisor D greater than its square root, then there is necessarily a smaller divisor d such that:

$D \times d = N$

(thus, if $\frac{N}{D} = d$ , then $\frac{N}{d} = D$ )

5716 / 1 = 5716 (the remainder is 0, so 1 and 5716 are divisors of 5716)
5716 / 2 = 2858 (the remainder is 0, so 2 and 2858 are divisors of 5716)
5716 / 3 = 1905.3333333333 (the remainder is 1, so 3 is not a divisor of 5716)
...
5716 / 74 = 77.243243243243 (the remainder is 18, so 74 is not a divisor of 5716)
5716 / 75 = 76.213333333333 (the remainder is 16, so 75 is not a divisor of 5716)