What is the Greatest Common Factor of 18915 and 18921?

Greatest common factor (GCF) of 18915 and 18921 is 3.

GCF(18915,18921) = 3

We will now calculate the prime factors of 18915 and 18921, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 18915 and 18921.

How to find the GCF of 18915 and 18921?

We will first find the prime factorization of 18915 and 18921. After we will calculate the factors of 18915 and 18921 and find the biggest common factor number .

Step-1: Prime Factorization of 18915

Prime factors of 18915 are 3, 5, 13, 97. Prime factorization of 18915 in exponential form is:

18915 = 3¹ × 5¹ × 13¹ × 97¹

Step-2: Prime Factorization of 18921

Prime factors of 18921 are 3, 7, 17, 53. Prime factorization of 18921 in exponential form is:

18921 = 3¹ × 7¹ × 17¹ × 53¹

Step-3: Factors of 18915

List of positive integer factors of 18915 that divides 18915 without a remainder.

1, 3, 5, 13, 15, 39, 65, 97, 195, 291, 485, 1261, 1455, 3783, 6305

Step-4: Factors of 18921

List of positive integer factors of 18921 that divides 18915 without a remainder.

1, 3, 7, 17, 21, 51, 53, 119, 159, 357, 371, 901, 1113, 2703, 6307

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 18915 and 18921. The biggest common factor number is the GCF number.
So the greatest common factor 18915 and 18921 is 3.

Also check out the Least Common Multiple of 18915 and 18921