Prime Factorization of 18

"Prime Factorization" Calculator

What is the Prime Factorization of 18?

Answer

Prime Factors of 18:

2, 3, 3

18 = 2 × 3² · composite · 6 factors · 3 prime factors counting repeats

Division ladder

18	2
9	3
3	3
1

Left: what is left; right: the smallest prime that divides it; 1 at the bottom.

Second way — factor tree

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See Also

Factors of a Number - List all Factors and Factor Pairs of a Number
Prime Number Checker - Find out whether a given number is Prime or not
Prime Numbers List - List of all Prime Numbers - how many Prime numbers are between

Recalculate with different values ↑

Prime Factorization Table

Number	Prime Factors
3	3
4	2²
5	5
6	2, 3
7	7
8	2³
9	3²
10	2, 5
11	11
12	2² × 3
13	13
14	2, 7
15	3, 5
16	2⁴
17	17
18	2 × 3²
19	19
20	2² × 5
21	3, 7
22	2, 11
23	23
24	2³ × 3
25	5²
26	2, 13
27	3³
28	2² × 7
29	29
30	2, 3, 5
31	31
32	2⁵

FAQ

What is the Prime Factorization of 18?

Prime Factors of 18: 2, 3, 3

How many prime factors does 18 have?

Number 18 has 3 prime factors counting repeats; 2 different: 2 and 3.

What is the Prime Factorization of 18 in exponential form?

The Prime Factorization of the number 18 in the exponential form is: 2 × 3²