Sum of the first 20 even numbers The first 20 even numbers range from 2 to 40. On this page, we will show you how to calculate the first 20 positive even whole numbers by using our formula.

The formula to calculate the sum of even numbers is: sum = n × ( n + 1) where n is the even numbers. When we enter 20 into our formula, we get the following:

20 × (20 + 1)
= 420

Therefore, the sum of the first 20 even numbers is 420.

Be aware that we consider 2 to be the first positive even number. If you consider 0 to be the first positive even number, then the answer to the sum of the first 20 even numbers would be 380.

Note that the sum of the first 20 even numbers is not the same as the sum of all even numbers up to 20. The sum of all even numbers from 1 to 20 inclusive is 110.

Sum of Even Numbers Calculator
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