What is the Greatest Common Factor of 19855 and 19866?

Greatest common factor (GCF) of 19855 and 19866 is 11.

GCF(19855,19866) = 11

We will now calculate the prime factors of 19855 and 19866, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19855 and 19866.

How to find the GCF of 19855 and 19866?

We will first find the prime factorization of 19855 and 19866. After we will calculate the factors of 19855 and 19866 and find the biggest common factor number .

Step-1: Prime Factorization of 19855

Prime factors of 19855 are 5, 11, 19. Prime factorization of 19855 in exponential form is:

19855 = 5¹ × 11¹ × 19²

Step-2: Prime Factorization of 19866

Prime factors of 19866 are 2, 3, 7, 11, 43. Prime factorization of 19866 in exponential form is:

19866 = 2¹ × 3¹ × 7¹ × 11¹ × 43¹

Step-3: Factors of 19855

List of positive integer factors of 19855 that divides 19855 without a remainder.

1, 5, 11, 19, 55, 95, 209, 361, 1045, 1805, 3971

Step-4: Factors of 19866

List of positive integer factors of 19866 that divides 19855 without a remainder.

1, 2, 3, 6, 7, 11, 14, 21, 22, 33, 42, 43, 66, 77, 86, 129, 154, 231, 258, 301, 462, 473, 602, 903, 946, 1419, 1806, 2838, 3311, 6622, 9933

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19855 and 19866. The biggest common factor number is the GCF number.
So the greatest common factor 19855 and 19866 is 11.

Also check out the Least Common Multiple of 19855 and 19866