GCF for 20 and 98

What is the Greatest Common Factor of 20 and 98?

Answer: GCF of 20 and 98 is 2

(Two)

Finding GCF for 20 and 98 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 98 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 98: 1, 2, 7, 14, 49, 98

So the Greatest Common Factor for 20 and 98 is 2

Finding GCF for 20 and 98 by Prime Factorization

The second method to find GCF for numbers 20 and 98 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 98: 2, 7, 7

As we can see there is only one Prime Factor common to both numbers. It is 2

So 2 is the Greatest Common Factor of 20 and 98

GCF Table

Number 1Number 2GCF
5981
6982
7987
8982
9981
10982
11981
12982
13981
149814
15981
16982
17981
18982
19981
20982
21987
22982
23981
24982
25981
26982
27981
2898
29981
30982
31981
32982
33981
34982

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 98? (The answer is: 2). Select the first number (e.g. '20') and the second number (e.g. '98'). 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 98?

GCF of 20 and 98 is 2