What is the Greatest Common Factor of 42009 and 42020?

Greatest common factor (GCF) of 42009 and 42020 is 11.

GCF(42009,42020) = 11

We will now calculate the prime factors of 42009 and 42020, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 42009 and 42020.

How to find the GCF of 42009 and 42020?

We will first find the prime factorization of 42009 and 42020. After we will calculate the factors of 42009 and 42020 and find the biggest common factor number .

Step-1: Prime Factorization of 42009

Prime factors of 42009 are 3, 11, 19, 67. Prime factorization of 42009 in exponential form is:

42009 = 3¹ × 11¹ × 19¹ × 67¹

Step-2: Prime Factorization of 42020

Prime factors of 42020 are 2, 5, 11, 191. Prime factorization of 42020 in exponential form is:

42020 = 2² × 5¹ × 11¹ × 191¹

Step-3: Factors of 42009

List of positive integer factors of 42009 that divides 42009 without a remainder.

1, 3, 11, 19, 33, 57, 67, 201, 209, 627, 737, 1273, 2211, 3819, 14003

Step-4: Factors of 42020

List of positive integer factors of 42020 that divides 42009 without a remainder.

1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 191, 220, 382, 764, 955, 1910, 2101, 3820, 4202, 8404, 10505, 21010

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 42009 and 42020. The biggest common factor number is the GCF number.
So the greatest common factor 42009 and 42020 is 11.

Also check out the Least Common Multiple of 42009 and 42020