What is the Greatest Common Factor of 39855 and 39870?

Greatest common factor (GCF) of 39855 and 39870 is 15.

GCF(39855,39870) = 15

We will now calculate the prime factors of 39855 and 39870, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 39855 and 39870.

How to find the GCF of 39855 and 39870?

We will first find the prime factorization of 39855 and 39870. After we will calculate the factors of 39855 and 39870 and find the biggest common factor number .

Step-1: Prime Factorization of 39855

Prime factors of 39855 are 3, 5, 2657. Prime factorization of 39855 in exponential form is:

39855 = 3¹ × 5¹ × 2657¹

Step-2: Prime Factorization of 39870

Prime factors of 39870 are 2, 3, 5, 443. Prime factorization of 39870 in exponential form is:

39870 = 2¹ × 3² × 5¹ × 443¹

Step-3: Factors of 39855

List of positive integer factors of 39855 that divides 39855 without a remainder.

1, 3, 5, 15, 2657, 7971, 13285

Step-4: Factors of 39870

List of positive integer factors of 39870 that divides 39855 without a remainder.

1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90, 443, 886, 1329, 2215, 2658, 3987, 4430, 6645, 7974, 13290, 19935

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 39855 and 39870. The biggest common factor number is the GCF number.
So the greatest common factor 39855 and 39870 is 15.

Also check out the Least Common Multiple of 39855 and 39870