What is the Greatest Common Factor of 20561 and 20580?

Greatest common factor (GCF) of 20561 and 20580 is 1.

GCF(20561,20580) = 1

We will now calculate the prime factors of 20561 and 20580, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20561 and 20580.

How to find the GCF of 20561 and 20580?

We will first find the prime factorization of 20561 and 20580. After we will calculate the factors of 20561 and 20580 and find the biggest common factor number .

Step-1: Prime Factorization of 20561

Prime factors of 20561 are 29, 709. Prime factorization of 20561 in exponential form is:

20561 = 29¹ × 709¹

Step-2: Prime Factorization of 20580

Prime factors of 20580 are 2, 3, 5, 7. Prime factorization of 20580 in exponential form is:

20580 = 2² × 3¹ × 5¹ × 7³

Step-3: Factors of 20561

List of positive integer factors of 20561 that divides 20561 without a remainder.

1, 29, 709

Step-4: Factors of 20580

List of positive integer factors of 20580 that divides 20561 without a remainder.

1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 84, 98, 105, 140, 147, 196, 210, 245, 294, 343, 420, 490, 588, 686, 735, 980, 1029, 1372, 1470, 1715, 2058, 2940, 3430, 4116, 5145, 6860, 10290

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20561 and 20580. The biggest common factor number is the GCF number.
So the greatest common factor 20561 and 20580 is 1.

Also check out the Least Common Multiple of 20561 and 20580