GCF for 20 and 55

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

What is the Greatest common Divisor of 20 and 55?

Answer: GCF of 20 and 55 is 5

(Five)

Finding GCF for 20 and 55 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 55 is to list all factors for both numbers and pick the highest common one:

All factors of 20: 1, 2, 4, 5, 10, 20

All factors of 55: 1, 5, 11, 55

So the Greatest Common Factor for 20 and 55 is 5

Finding GCF for 20 and 55 by Prime Factorization

The second method to find GCF for numbers 20 and 55 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 20: 2, 2, 5

All Prime Factors of 55: 5, 11

As we can see there is only one Prime Factor common to both numbers. It is 5

So 5 is the Greatest Common Factor of 20 and 55

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About "Greatest Common Factor" Calculator

This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest common Divisor of 20 and 55? (The answer is: 5). Select the first number (e.g. '20') and the second number (e.g. '55'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

GCF Table

Number 1Number 2GCF
5555
6551
7551
8551
9551
10555
115511
12551
13551
14551
15555
16551
17551
18551
19551
20555
21551
225511
23551
24551
25555
26551
27551
28551
29551
30555
31551
32551
335511
34551

FAQ

What is the Greatest common Divisor of 20 and 55?

GCF of 20 and 55 is 5

See Also