What is the Greatest Common Factor of 21790 and 21806?

Greatest common factor (GCF) of 21790 and 21806 is 2.

GCF(21790,21806) = 2

We will now calculate the prime factors of 21790 and 21806, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21790 and 21806.

How to find the GCF of 21790 and 21806?

We will first find the prime factorization of 21790 and 21806. After we will calculate the factors of 21790 and 21806 and find the biggest common factor number .

Step-1: Prime Factorization of 21790

Prime factors of 21790 are 2, 5, 2179. Prime factorization of 21790 in exponential form is:

21790 = 2¹ × 5¹ × 2179¹

Step-2: Prime Factorization of 21806

Prime factors of 21806 are 2, 10903. Prime factorization of 21806 in exponential form is:

21806 = 2¹ × 10903¹

Step-3: Factors of 21790

List of positive integer factors of 21790 that divides 21790 without a remainder.

1, 2, 5, 10, 2179, 4358, 10895

Step-4: Factors of 21806

List of positive integer factors of 21806 that divides 21790 without a remainder.

1, 2, 10903

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21790 and 21806. The biggest common factor number is the GCF number.
So the greatest common factor 21790 and 21806 is 2.

Also check out the Least Common Multiple of 21790 and 21806