What are the divisors of 4427?

1, 19, 233, 4427

There is a total of 4 positive divisors.
The sum of these divisors is 4680.
The arithmetic mean is 1170.

4 odd divisors

1, 19, 233, 4427

How to compute the divisors of 4427?

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 4427 by each of the numbers from 1 to 4427 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)

4427 / 1 = 4427 (the remainder is 0, so 1 is a divisor of 4427)
4427 / 2 = 2213.5 (the remainder is 1, so 2 is not a divisor of 4427)
4427 / 3 = 1475.6666666667 (the remainder is 2, so 3 is not a divisor of 4427)
...
4427 / 4426 = 1.0002259376412 (the remainder is 1, so 4426 is not a divisor of 4427)
4427 / 4427 = 1 (the remainder is 0, so 4427 is a divisor of 4427)

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 4427 (i.e. 66.535704700559). 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 $\frac{N}{d} = D$ )

4427 / 1 = 4427 (the remainder is 0, so 1 and 4427 are divisors of 4427)
4427 / 2 = 2213.5 (the remainder is 1, so 2 is not a divisor of 4427)
4427 / 3 = 1475.6666666667 (the remainder is 2, so 3 is not a divisor of 4427)
...
4427 / 65 = 68.107692307692 (the remainder is 7, so 65 is not a divisor of 4427)
4427 / 66 = 67.075757575758 (the remainder is 5, so 66 is not a divisor of 4427)