What is the Greatest Common Factor of 20385 and 20405?

Greatest common factor (GCF) of 20385 and 20405 is 5.

GCF(20385,20405) = 5

We will now calculate the prime factors of 20385 and 20405, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 20385 and 20405.

How to find the GCF of 20385 and 20405?

We will first find the prime factorization of 20385 and 20405. After we will calculate the factors of 20385 and 20405 and find the biggest common factor number .

Step-1: Prime Factorization of 20385

Prime factors of 20385 are 3, 5, 151. Prime factorization of 20385 in exponential form is:

20385 = 3³ × 5¹ × 151¹

Step-2: Prime Factorization of 20405

Prime factors of 20405 are 5, 7, 11, 53. Prime factorization of 20405 in exponential form is:

20405 = 5¹ × 7¹ × 11¹ × 53¹

Step-3: Factors of 20385

List of positive integer factors of 20385 that divides 20385 without a remainder.

1, 3, 5, 9, 15, 27, 45, 135, 151, 453, 755, 1359, 2265, 4077, 6795

Step-4: Factors of 20405

List of positive integer factors of 20405 that divides 20385 without a remainder.

1, 5, 7, 11, 35, 53, 55, 77, 265, 371, 385, 583, 1855, 2915, 4081

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 20385 and 20405. The biggest common factor number is the GCF number.
So the greatest common factor 20385 and 20405 is 5.

Also check out the Least Common Multiple of 20385 and 20405