What is the Greatest Common Factor of 18405 and 18421?

Greatest common factor (GCF) of 18405 and 18421 is 1.

GCF(18405,18421) = 1

We will now calculate the prime factors of 18405 and 18421, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 18405 and 18421.

How to find the GCF of 18405 and 18421?

We will first find the prime factorization of 18405 and 18421. After we will calculate the factors of 18405 and 18421 and find the biggest common factor number .

Step-1: Prime Factorization of 18405

Prime factors of 18405 are 3, 5, 409. Prime factorization of 18405 in exponential form is:

18405 = 3² × 5¹ × 409¹

Step-2: Prime Factorization of 18421

Prime factors of 18421 are 13, 109. Prime factorization of 18421 in exponential form is:

18421 = 13² × 109¹

Step-3: Factors of 18405

List of positive integer factors of 18405 that divides 18405 without a remainder.

1, 3, 5, 9, 15, 45, 409, 1227, 2045, 3681, 6135

Step-4: Factors of 18421

List of positive integer factors of 18421 that divides 18405 without a remainder.

1, 13, 109, 169, 1417

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 18405 and 18421. The biggest common factor number is the GCF number.
So the greatest common factor 18405 and 18421 is 1.

Also check out the Least Common Multiple of 18405 and 18421