What is the Greatest Common Factor of 21480 and 21485?

Greatest common factor (GCF) of 21480 and 21485 is 5.

GCF(21480,21485) = 5

We will now calculate the prime factors of 21480 and 21485, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 21480 and 21485.

How to find the GCF of 21480 and 21485?

We will first find the prime factorization of 21480 and 21485. After we will calculate the factors of 21480 and 21485 and find the biggest common factor number .

Step-1: Prime Factorization of 21480

Prime factors of 21480 are 2, 3, 5, 179. Prime factorization of 21480 in exponential form is:

21480 = 2³ × 3¹ × 5¹ × 179¹

Step-2: Prime Factorization of 21485

Prime factors of 21485 are 5, 4297. Prime factorization of 21485 in exponential form is:

21485 = 5¹ × 4297¹

Step-3: Factors of 21480

List of positive integer factors of 21480 that divides 21480 without a remainder.

1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120, 179, 358, 537, 716, 895, 1074, 1432, 1790, 2148, 2685, 3580, 4296, 5370, 7160, 10740

Step-4: Factors of 21485

List of positive integer factors of 21485 that divides 21480 without a remainder.

1, 5, 4297

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 21480 and 21485. The biggest common factor number is the GCF number.
So the greatest common factor 21480 and 21485 is 5.

Also check out the Least Common Multiple of 21480 and 21485