What are the divisors of 2776?

1, 2, 4, 8, 347, 694, 1388, 2776

There is a total of 8 positive divisors.
The sum of these divisors is 5220.
The arithmetic mean is 652.5.

6 even divisors

2, 4, 8, 694, 1388, 2776

2 odd divisors

1, 347

How to compute the divisors of 2776?

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 2776 by each of the numbers from 1 to 2776 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)

2776 / 1 = 2776 (the remainder is 0, so 1 is a divisor of 2776)
2776 / 2 = 1388 (the remainder is 0, so 2 is a divisor of 2776)
2776 / 3 = 925.33333333333 (the remainder is 1, so 3 is not a divisor of 2776)
...
2776 / 2775 = 1.0003603603604 (the remainder is 1, so 2775 is not a divisor of 2776)
2776 / 2776 = 1 (the remainder is 0, so 2776 is a divisor of 2776)

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 2776 (i.e. 52.687759489278). 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 $\frac{N}{d} = D$ )

2776 / 1 = 2776 (the remainder is 0, so 1 and 2776 are divisors of 2776)
2776 / 2 = 1388 (the remainder is 0, so 2 and 1388 are divisors of 2776)
2776 / 3 = 925.33333333333 (the remainder is 1, so 3 is not a divisor of 2776)
...
2776 / 51 = 54.43137254902 (the remainder is 22, so 51 is not a divisor of 2776)
2776 / 52 = 53.384615384615 (the remainder is 20, so 52 is not a divisor of 2776)