What is the Greatest Common Factor of 8415 and 8420?

Greatest common factor (GCF) of 8415 and 8420 is 5.

GCF(8415,8420) = 5

We will now calculate the prime factors of 8415 and 8420, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 8415 and 8420.

How to find the GCF of 8415 and 8420?

We will first find the prime factorization of 8415 and 8420. After we will calculate the factors of 8415 and 8420 and find the biggest common factor number .

Step-1: Prime Factorization of 8415

Prime factors of 8415 are 3, 5, 11, 17. Prime factorization of 8415 in exponential form is:

8415 = 3² × 5¹ × 11¹ × 17¹

Step-2: Prime Factorization of 8420

Prime factors of 8420 are 2, 5, 421. Prime factorization of 8420 in exponential form is:

8420 = 2² × 5¹ × 421¹

Step-3: Factors of 8415

List of positive integer factors of 8415 that divides 8415 without a remainder.

1, 3, 5, 9, 11, 15, 17, 33, 45, 51, 55, 85, 99, 153, 165, 187, 255, 495, 561, 765, 935, 1683, 2805

Step-4: Factors of 8420

List of positive integer factors of 8420 that divides 8415 without a remainder.

1, 2, 4, 5, 10, 20, 421, 842, 1684, 2105, 4210

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 8415 and 8420. The biggest common factor number is the GCF number.
So the greatest common factor 8415 and 8420 is 5.

Also check out the Least Common Multiple of 8415 and 8420