What is the Greatest Common Factor of 21785 and 21790?

Greatest common factor (GCF) of 21785 and 21790 is 5.

GCF(21785,21790) = 5

We will now calculate the prime factors of 21785 and 21790, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21785 and 21790.

How to find the GCF of 21785 and 21790?

We will first find the prime factorization of 21785 and 21790. After we will calculate the factors of 21785 and 21790 and find the biggest common factor number .

Step-1: Prime Factorization of 21785

Prime factors of 21785 are 5, 4357. Prime factorization of 21785 in exponential form is:

21785 = 5¹ × 4357¹

Step-2: 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-3: Factors of 21785

List of positive integer factors of 21785 that divides 21785 without a remainder.

1, 5, 4357

Step-4: Factors of 21790

List of positive integer factors of 21790 that divides 21785 without a remainder.

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

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21785 and 21790. The biggest common factor number is the GCF number.
So the greatest common factor 21785 and 21790 is 5.

Also check out the Least Common Multiple of 21785 and 21790