What is the Greatest Common Factor of 4005 and 4020?

Greatest common factor (GCF) of 4005 and 4020 is 15.

GCF(4005,4020) = 15

We will now calculate the prime factors of 4005 and 4020, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 4005 and 4020.

How to find the GCF of 4005 and 4020?

We will first find the prime factorization of 4005 and 4020. After we will calculate the factors of 4005 and 4020 and find the biggest common factor number .

Step-1: Prime Factorization of 4005

Prime factors of 4005 are 3, 5, 89. Prime factorization of 4005 in exponential form is:

4005 = 3² × 5¹ × 89¹

Step-2: Prime Factorization of 4020

Prime factors of 4020 are 2, 3, 5, 67. Prime factorization of 4020 in exponential form is:

4020 = 2² × 3¹ × 5¹ × 67¹

Step-3: Factors of 4005

List of positive integer factors of 4005 that divides 4005 without a remainder.

1, 3, 5, 9, 15, 45, 89, 267, 445, 801, 1335

Step-4: Factors of 4020

List of positive integer factors of 4020 that divides 4005 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 67, 134, 201, 268, 335, 402, 670, 804, 1005, 1340, 2010

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 4005 and 4020. The biggest common factor number is the GCF number.
So the greatest common factor 4005 and 4020 is 15.

Also check out the Least Common Multiple of 4005 and 4020