What is the Greatest Common Factor of 21540 and 21545?

Greatest common factor (GCF) of 21540 and 21545 is 5.

GCF(21540,21545) = 5

We will now calculate the prime factors of 21540 and 21545, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21540 and 21545.

How to find the GCF of 21540 and 21545?

We will first find the prime factorization of 21540 and 21545. After we will calculate the factors of 21540 and 21545 and find the biggest common factor number .

Step-1: Prime Factorization of 21540

Prime factors of 21540 are 2, 3, 5, 359. Prime factorization of 21540 in exponential form is:

21540 = 2² × 3¹ × 5¹ × 359¹

Step-2: Prime Factorization of 21545

Prime factors of 21545 are 5, 31, 139. Prime factorization of 21545 in exponential form is:

21545 = 5¹ × 31¹ × 139¹

Step-3: Factors of 21540

List of positive integer factors of 21540 that divides 21540 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 359, 718, 1077, 1436, 1795, 2154, 3590, 4308, 5385, 7180, 10770

Step-4: Factors of 21545

List of positive integer factors of 21545 that divides 21540 without a remainder.

1, 5, 31, 139, 155, 695, 4309

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21540 and 21545. The biggest common factor number is the GCF number.
So the greatest common factor 21540 and 21545 is 5.

Also check out the Least Common Multiple of 21540 and 21545