What are the divisors of 3716?

1, 2, 4, 929, 1858, 3716

There is a total of 6 positive divisors.
The sum of these divisors is 6510.
The arithmetic mean is 1085.

4 even divisors

2, 4, 1858, 3716

2 odd divisors

1, 929

How to compute the divisors of 3716?

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 3716 by each of the numbers from 1 to 3716 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)

3716 / 1 = 3716 (the remainder is 0, so 1 is a divisor of 3716)
3716 / 2 = 1858 (the remainder is 0, so 2 is a divisor of 3716)
3716 / 3 = 1238.6666666667 (the remainder is 2, so 3 is not a divisor of 3716)
...
3716 / 3715 = 1.000269179004 (the remainder is 1, so 3715 is not a divisor of 3716)
3716 / 3716 = 1 (the remainder is 0, so 3716 is a divisor of 3716)

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 3716 (i.e. 60.959002616513). 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 $\frac{N}{d} = D$ )

3716 / 1 = 3716 (the remainder is 0, so 1 and 3716 are divisors of 3716)
3716 / 2 = 1858 (the remainder is 0, so 2 and 1858 are divisors of 3716)
3716 / 3 = 1238.6666666667 (the remainder is 2, so 3 is not a divisor of 3716)
...
3716 / 59 = 62.983050847458 (the remainder is 58, so 59 is not a divisor of 3716)
3716 / 60 = 61.933333333333 (the remainder is 56, so 60 is not a divisor of 3716)