Factor Calculator

List all the factors (divisors) of a number, with their count and sum. Enter a whole number.

Number of Factors
—
Divisors in total.

Usage Tip

Factors pair up: for 24, 1×24, 2×12, 3×8, 4×6 — find one and you get its partner for free.

THE MATH
A factor (divisor) divides the number with no remainder
Found by checking up to the square root and pairing
The factors of a number are all the whole numbers that divide it evenly, always in pairs around the square root.
A prime has exactly two factors; a perfect number equals the sum of its proper factors.
Factors are listed in order with their count and sum.
A number with exactly two factors is prime.
Perfect numbers (6, 28, 496) equal the sum of their proper divisors.
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