What is the Greatest Common Factor of 1020 and 1040?

Greatest common factor (GCF) of 1020 and 1040 is 20.

GCF(1020,1040) = 20

We will now calculate the prime factors of 1020 and 1040, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1020 and 1040.

How to find the GCF of 1020 and 1040?

We will first find the prime factorization of 1020 and 1040. After we will calculate the factors of 1020 and 1040 and find the biggest common factor number .

Step-1: Prime Factorization of 1020

Prime factors of 1020 are 2, 3, 5, 17. Prime factorization of 1020 in exponential form is:

1020 = 2² × 3¹ × 5¹ × 17¹

Step-2: Prime Factorization of 1040

Prime factors of 1040 are 2, 5, 13. Prime factorization of 1040 in exponential form is:

1040 = 2⁴ × 5¹ × 13¹

Step-3: Factors of 1020

List of positive integer factors of 1020 that divides 1020 without a remainder.

1, 2, 3, 4, 5, 6, 10, 12, 15, 17, 20, 30, 34, 51, 60, 68, 85, 102, 170, 204, 255, 340, 510

Step-4: Factors of 1040

List of positive integer factors of 1040 that divides 1020 without a remainder.

1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1020 and 1040. The biggest common factor number is the GCF number.
So the greatest common factor 1020 and 1040 is 20.

Also check out the Least Common Multiple of 1020 and 1040