What is the Greatest Common Factor of 78820 and 78840?

Greatest common factor (GCF) of 78820 and 78840 is 20.

GCF(78820,78840) = 20

We will now calculate the prime factors of 78820 and 78840, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 78820 and 78840.

How to find the GCF of 78820 and 78840?

We will first find the prime factorization of 78820 and 78840. After we will calculate the factors of 78820 and 78840 and find the biggest common factor number .

Step-1: Prime Factorization of 78820

Prime factors of 78820 are 2, 5, 7, 563. Prime factorization of 78820 in exponential form is:

78820 = 2² × 5¹ × 7¹ × 563¹

Step-2: Prime Factorization of 78840

Prime factors of 78840 are 2, 3, 5, 73. Prime factorization of 78840 in exponential form is:

78840 = 2³ × 3³ × 5¹ × 73¹

Step-3: Factors of 78820

List of positive integer factors of 78820 that divides 78820 without a remainder.

1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 563, 1126, 2252, 2815, 3941, 5630, 7882, 11260, 15764, 19705, 39410

Step-4: Factors of 78840

List of positive integer factors of 78840 that divides 78820 without a remainder.

1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 27, 30, 36, 40, 45, 54, 60, 72, 73, 90, 108, 120, 135, 146, 180, 216, 219, 270, 292, 360, 365, 438, 540, 584, 657, 730, 876, 1080, 1095, 1314, 1460, 1752, 1971, 2190, 2628, 2920, 3285, 3942, 4380, 5256, 6570, 7884, 8760, 9855, 13140, 15768, 19710, 26280, 39420

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 78820 and 78840. The biggest common factor number is the GCF number.
So the greatest common factor 78820 and 78840 is 20.

Also check out the Least Common Multiple of 78820 and 78840