What is the Greatest Common Factor of 12815 and 12820?

Greatest common factor (GCF) of 12815 and 12820 is 5.

GCF(12815,12820) = 5

We will now calculate the prime factors of 12815 and 12820, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 12815 and 12820.

How to find the GCF of 12815 and 12820?

We will first find the prime factorization of 12815 and 12820. After we will calculate the factors of 12815 and 12820 and find the biggest common factor number .

Step-1: Prime Factorization of 12815

Prime factors of 12815 are 5, 11, 233. Prime factorization of 12815 in exponential form is:

12815 = 5¹ × 11¹ × 233¹

Step-2: Prime Factorization of 12820

Prime factors of 12820 are 2, 5, 641. Prime factorization of 12820 in exponential form is:

12820 = 2² × 5¹ × 641¹

Step-3: Factors of 12815

List of positive integer factors of 12815 that divides 12815 without a remainder.

1, 5, 11, 55, 233, 1165, 2563

Step-4: Factors of 12820

List of positive integer factors of 12820 that divides 12815 without a remainder.

1, 2, 4, 5, 10, 20, 641, 1282, 2564, 3205, 6410

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 12815 and 12820. The biggest common factor number is the GCF number.
So the greatest common factor 12815 and 12820 is 5.

Also check out the Least Common Multiple of 12815 and 12820