What is the Greatest Common Factor of 19780 and 19786?

Greatest common factor (GCF) of 19780 and 19786 is 2.

GCF(19780,19786) = 2

We will now calculate the prime factors of 19780 and 19786, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19780 and 19786.

How to find the GCF of 19780 and 19786?

We will first find the prime factorization of 19780 and 19786. After we will calculate the factors of 19780 and 19786 and find the biggest common factor number .

Step-1: Prime Factorization of 19780

Prime factors of 19780 are 2, 5, 23, 43. Prime factorization of 19780 in exponential form is:

19780 = 2² × 5¹ × 23¹ × 43¹

Step-2: Prime Factorization of 19786

Prime factors of 19786 are 2, 13, 761. Prime factorization of 19786 in exponential form is:

19786 = 2¹ × 13¹ × 761¹

Step-3: Factors of 19780

List of positive integer factors of 19780 that divides 19780 without a remainder.

1, 2, 4, 5, 10, 20, 23, 43, 46, 86, 92, 115, 172, 215, 230, 430, 460, 860, 989, 1978, 3956, 4945, 9890

Step-4: Factors of 19786

List of positive integer factors of 19786 that divides 19780 without a remainder.

1, 2, 13, 26, 761, 1522, 9893

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19780 and 19786. The biggest common factor number is the GCF number.
So the greatest common factor 19780 and 19786 is 2.

Also check out the Least Common Multiple of 19780 and 19786