Greatest Common Divisor (GCD) of 4, 19 and 20

The Greatest Common Divisor (GCD) of 4, 19 and 20 is the largest positive integer that equally divides all three numbers: 4, 19 and 20. Mathematically, the problem we are solving is:

GCD(4,19,20)

To solve the problem, we will list all the positive integers (divisors) that can be divided into 4, 19 and 20. We will then compare the lists of divisors to find the greatest divisor they have in common.

Divisors of 4:
1, 2, and 4.

Divisors of 19:
1 and 19.

Divisors of 20:
1, 2, 4, 5, 10, and 20.

When we compare the lists of divisors above, we see that the largest number they have in common is 1. Thus, the Greatest Common Divisor (GCD) of 4, 19 and 20 is:

GCD(4,19,20) = 1

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Greatest Common Divisor (GCD) of 4, 19 and 21
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