What is the Greatest Common Factor of 81820 and 81840?

Greatest common factor (GCF) of 81820 and 81840 is 20.

GCF(81820,81840) = 20

We will now calculate the prime factors of 81820 and 81840, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 81820 and 81840.

How to find the GCF of 81820 and 81840?

We will first find the prime factorization of 81820 and 81840. After we will calculate the factors of 81820 and 81840 and find the biggest common factor number .

Step-1: Prime Factorization of 81820

Prime factors of 81820 are 2, 5, 4091. Prime factorization of 81820 in exponential form is:

81820 = 2² × 5¹ × 4091¹

Step-2: Prime Factorization of 81840

Prime factors of 81840 are 2, 3, 5, 11, 31. Prime factorization of 81840 in exponential form is:

81840 = 2⁴ × 3¹ × 5¹ × 11¹ × 31¹

Step-3: Factors of 81820

List of positive integer factors of 81820 that divides 81820 without a remainder.

1, 2, 4, 5, 10, 20, 4091, 8182, 16364, 20455, 40910

Step-4: Factors of 81840

List of positive integer factors of 81840 that divides 81820 without a remainder.

1, 2, 3, 4, 5, 6, 8, 10, 11, 12, 15, 16, 20, 22, 24, 30, 31, 33, 40, 44, 48, 55, 60, 62, 66, 80, 88, 93, 110, 120, 124, 132, 155, 165, 176, 186, 220, 240, 248, 264, 310, 330, 341, 372, 440, 465, 496, 528, 620, 660, 682, 744, 880, 930, 1023, 1240, 1320, 1364, 1488, 1705, 1860, 2046, 2480, 2640, 2728, 3410, 3720, 4092, 5115, 5456, 6820, 7440, 8184, 10230, 13640, 16368, 20460, 27280, 40920

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 81820 and 81840. The biggest common factor number is the GCF number.
So the greatest common factor 81820 and 81840 is 20.

Also check out the Least Common Multiple of 81820 and 81840