What is the Greatest Common Factor of 18990 and 18997?

Greatest common factor (GCF) of 18990 and 18997 is 1.

GCF(18990,18997) = 1

We will now calculate the prime factors of 18990 and 18997, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 18990 and 18997.

How to find the GCF of 18990 and 18997?

We will first find the prime factorization of 18990 and 18997. After we will calculate the factors of 18990 and 18997 and find the biggest common factor number .

Step-1: Prime Factorization of 18990

Prime factors of 18990 are 2, 3, 5, 211. Prime factorization of 18990 in exponential form is:

18990 = 2¹ × 3² × 5¹ × 211¹

Step-2: Prime Factorization of 18997

Prime factors of 18997 are 11, 157. Prime factorization of 18997 in exponential form is:

18997 = 11² × 157¹

Step-3: Factors of 18990

List of positive integer factors of 18990 that divides 18990 without a remainder.

1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90, 211, 422, 633, 1055, 1266, 1899, 2110, 3165, 3798, 6330, 9495

Step-4: Factors of 18997

List of positive integer factors of 18997 that divides 18990 without a remainder.

1, 11, 121, 157, 1727

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 18990 and 18997. The biggest common factor number is the GCF number.
So the greatest common factor 18990 and 18997 is 1.

Also check out the Least Common Multiple of 18990 and 18997