What is the Greatest Common Factor of 19809 and 19818?

Greatest common factor (GCF) of 19809 and 19818 is 9.

GCF(19809,19818) = 9

We will now calculate the prime factors of 19809 and 19818, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19809 and 19818.

How to find the GCF of 19809 and 19818?

We will first find the prime factorization of 19809 and 19818. After we will calculate the factors of 19809 and 19818 and find the biggest common factor number .

Step-1: Prime Factorization of 19809

Prime factors of 19809 are 3, 31, 71. Prime factorization of 19809 in exponential form is:

19809 = 3² × 31¹ × 71¹

Step-2: Prime Factorization of 19818

Prime factors of 19818 are 2, 3, 367. Prime factorization of 19818 in exponential form is:

19818 = 2¹ × 3³ × 367¹

Step-3: Factors of 19809

List of positive integer factors of 19809 that divides 19809 without a remainder.

1, 3, 9, 31, 71, 93, 213, 279, 639, 2201, 6603

Step-4: Factors of 19818

List of positive integer factors of 19818 that divides 19809 without a remainder.

1, 2, 3, 6, 9, 18, 27, 54, 367, 734, 1101, 2202, 3303, 6606, 9909

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19809 and 19818. The biggest common factor number is the GCF number.
So the greatest common factor 19809 and 19818 is 9.

Also check out the Least Common Multiple of 19809 and 19818