GCF for 20 and 320

What is the Greatest Common Factor of 20 and 320?

Answer: GCF of 20 and 320 is 20

(Twenty)

Finding GCF for 20 and 320 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 320 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 320: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 160, 320

So the Greatest Common Factor for 20 and 320 is 20

Finding GCF for 20 and 320 by Prime Factorization

The second method to find GCF for numbers 20 and 320 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 320: 2, 2, 2, 2, 2, 2, 5

As we can see there are Prime Factors common to both numbers: 2, 2, 5

Now we need to multiply them to find GCF: 2 × 2 × 5 = 20

Related Calculations

GCF Table

Number 1Number 2GCF
53205
63202
73201
83208
93201
1032010
113201
123204
133201
143202
153205
1632016
173201
183202
193201
2032020
213201
223202
233201
243208
253205
263202
273201
283204
293201
3032010
313201
3232032
333201
343202

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 Factor of 20 and 320? (The answer is: 20). Select the first number (e.g. '20') and the second number (e.g. '320'). 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

FAQ

What is the Greatest Common Factor of 20 and 320?

GCF of 20 and 320 is 20