What are the divisors of 8233?

1, 8233

There is a total of 2 positive divisors.
The sum of these divisors is 8234.
The arithmetic mean is 4117.

2 odd divisors

1, 8233

How to compute the divisors of 8233?

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 8233 by each of the numbers from 1 to 8233 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)

8233 / 1 = 8233 (the remainder is 0, so 1 is a divisor of 8233)
8233 / 2 = 4116.5 (the remainder is 1, so 2 is not a divisor of 8233)
8233 / 3 = 2744.3333333333 (the remainder is 1, so 3 is not a divisor of 8233)
...
8233 / 8232 = 1.0001214771623 (the remainder is 1, so 8232 is not a divisor of 8233)
8233 / 8233 = 1 (the remainder is 0, so 8233 is a divisor of 8233)

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 8233 (i.e. 90.735880444287). 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 $\frac{N}{d} = D$ )

8233 / 1 = 8233 (the remainder is 0, so 1 and 8233 are divisors of 8233)
8233 / 2 = 4116.5 (the remainder is 1, so 2 is not a divisor of 8233)
8233 / 3 = 2744.3333333333 (the remainder is 1, so 3 is not a divisor of 8233)
...
8233 / 89 = 92.505617977528 (the remainder is 45, so 89 is not a divisor of 8233)
8233 / 90 = 91.477777777778 (the remainder is 43, so 90 is not a divisor of 8233)