Factors of 18

"Factors of a Number" Calculator

What are the Factors of 18?

Answer

Factors of 18:

1, 2, 3, 6, 9, 18

6 factors · 18 = 2 × 3² · composite

Underlined — prime: 2, 3 · 1 — neither prime nor composite · others — composite

Factor pairs of 18

3 pairs: 1 × 18 · 2 × 9 · 3 × 6

Past √18 ≈ 4.24 every pair would repeat one already found — so checking stops at 4.

18 = 2 × 3² → (1 + 1) × (2 + 1) = 6 factors: add 1 to each exponent and multiply.

Related Calculations

See Also

Prime Number Checker - Find out whether a given number is Prime or not
Prime Factorization - Prime Factorization Calculator
Prime Numbers List - List of all Prime Numbers - how many Prime numbers are between

Recalculate with different values ↑

Factors Table

Number	Factors
3	1, 3
4	1, 2, 4
5	1, 5
6	1, 2, 3, 6
7	1, 7
8	1, 2, 4, 8
9	1, 3, 9
10	1, 2, 5, 10
11	1, 11
12	1, 2, 3, 4, 6, 12
13	1, 13
14	1, 2, 7, 14
15	1, 3, 5, 15
16	1, 2, 4, 8, 16
17	1, 17
18	1, 2, 3, 6, 9, 18
19	1, 19
20	1, 2, 4, 5, 10, 20
21	1, 3, 7, 21
22	1, 2, 11, 22
23	1, 23
24	1, 2, 3, 4, 6, 8, 12, 24
25	1, 5, 25
26	1, 2, 13, 26
27	1, 3, 9, 27
28	1, 2, 4, 7, 14, 28
29	1, 29
30	1, 2, 3, 5, 6, 10, 15, 30
31	1, 31
32	1, 2, 4, 8, 16, 32

FAQ

What are the Factors of 18?

Factors of 18: 1, 2, 3, 6, 9, 18

How many factors does 18 have?

Number 18 has 6 factors

How many Factor Pairs does 18 have?

Number 18 has 3 factor pairs

Is 18 a prime or composite number?

Composite: 18 = 2 × 3², so it has 6 factors — a prime has exactly two.

How many factors does 18 have excluding 1 and 18?

4: 2, 3, 6 and 9.