GCF for 20 and 845

What is the Greatest Common Factor of 20 and 845?

Answer: GCF of 20 and 845 is 5

(Five)

Finding GCF for 20 and 845 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 845 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 845: 1, 5, 13, 65, 169, 845

So the Greatest Common Factor for 20 and 845 is 5

Finding GCF for 20 and 845 by Prime Factorization

The second method to find GCF for numbers 20 and 845 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 845: 5, 13, 13

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 845

GCF Table

Number 1Number 2GCF
58455
68451
78451
88451
98451
108455
118451
128451
1384513
148451
158455
168451
178451
188451
198451
208455
218451
228451
238451
248451
258455
2684513
278451
288451
298451
308455
318451
328451
338451
348451

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 845? (The answer is: 5). Select the first number (e.g. '20') and the second number (e.g. '845'). 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 845?

GCF of 20 and 845 is 5