Well, honey, the sum of counting numbers from 1 to 20 is 210. You add up 1 + 2 + 3... all the way to 20 and you get your answer. So, go ahead and impress your friends with your newfound math knowledge.
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The sum of the first six counting numbers (1-6) is 19.
1, 2, 3, and 5
I assume you mean the first three "counting" (ordinal) numbers, which are 1, 2, and 3. The sum is therefore 1 + 4 + 9 = 14.
The sum of the squares of the first 20 natural numbers 1 to 20 is 2,870.
There are (not counting 1) three square numbers between 1 and 20.