What is the Greatest Common Factor of 19820 and 19840?

Greatest common factor (GCF) of 19820 and 19840 is 20.

GCF(19820,19840) = 20

We will now calculate the prime factors of 19820 and 19840, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19820 and 19840.

How to find the GCF of 19820 and 19840?

We will first find the prime factorization of 19820 and 19840. After we will calculate the factors of 19820 and 19840 and find the biggest common factor number .

Step-1: Prime Factorization of 19820

Prime factors of 19820 are 2, 5, 991. Prime factorization of 19820 in exponential form is:

19820 = 2² × 5¹ × 991¹

Step-2: Prime Factorization of 19840

Prime factors of 19840 are 2, 5, 31. Prime factorization of 19840 in exponential form is:

19840 = 2⁷ × 5¹ × 31¹

Step-3: Factors of 19820

List of positive integer factors of 19820 that divides 19820 without a remainder.

1, 2, 4, 5, 10, 20, 991, 1982, 3964, 4955, 9910

Step-4: Factors of 19840

List of positive integer factors of 19840 that divides 19820 without a remainder.

1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 310, 320, 496, 620, 640, 992, 1240, 1984, 2480, 3968, 4960, 9920

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19820 and 19840. The biggest common factor number is the GCF number.
So the greatest common factor 19820 and 19840 is 20.

Also check out the Least Common Multiple of 19820 and 19840