What are the divisors of 5669?

1, 5669

There is a total of 2 positive divisors.
The sum of these divisors is 5670.
The arithmetic mean is 2835.

2 odd divisors

1, 5669

How to compute the divisors of 5669?

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 5669 by each of the numbers from 1 to 5669 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)

5669 / 1 = 5669 (the remainder is 0, so 1 is a divisor of 5669)
5669 / 2 = 2834.5 (the remainder is 1, so 2 is not a divisor of 5669)
5669 / 3 = 1889.6666666667 (the remainder is 2, so 3 is not a divisor of 5669)
...
5669 / 5668 = 1.0001764290755 (the remainder is 1, so 5668 is not a divisor of 5669)
5669 / 5669 = 1 (the remainder is 0, so 5669 is a divisor of 5669)

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 5669 (i.e. 75.292761936324). 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 $\frac{N}{d} = D$ )

5669 / 1 = 5669 (the remainder is 0, so 1 and 5669 are divisors of 5669)
5669 / 2 = 2834.5 (the remainder is 1, so 2 is not a divisor of 5669)
5669 / 3 = 1889.6666666667 (the remainder is 2, so 3 is not a divisor of 5669)
...
5669 / 74 = 76.608108108108 (the remainder is 45, so 74 is not a divisor of 5669)
5669 / 75 = 75.586666666667 (the remainder is 44, so 75 is not a divisor of 5669)