What is the Greatest Common Factor of 19840 and 19860?

Greatest common factor (GCF) of 19840 and 19860 is 20.

GCF(19840,19860) = 20

We will now calculate the prime factors of 19840 and 19860, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 19840 and 19860.

How to find the GCF of 19840 and 19860?

We will first find the prime factorization of 19840 and 19860. After we will calculate the factors of 19840 and 19860 and find the biggest common factor number .

Step-1: 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-2: Prime Factorization of 19860

Prime factors of 19860 are 2, 3, 5, 331. Prime factorization of 19860 in exponential form is:

19860 = 2² × 3¹ × 5¹ × 331¹

Step-3: Factors of 19840

List of positive integer factors of 19840 that divides 19840 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

Step-4: Factors of 19860

List of positive integer factors of 19860 that divides 19840 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 331, 662, 993, 1324, 1655, 1986, 3310, 3972, 4965, 6620, 9930

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 19840 and 19860. The biggest common factor number is the GCF number.
So the greatest common factor 19840 and 19860 is 20.

Also check out the Least Common Multiple of 19840 and 19860