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Sum of the first 20 Natural Numbers

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Calculate the sum of the following

The first 20 Natural Numbers

Σ n Natural Numbers formula:
S20  =  n(n + 1)
  2

S20  =  20(20 + 1)
  2

S20  =  20(21)
  2

S20  =  420
  2

S20 = 210

Average (A) of the first 20 Natural Numbers
A  =  Sum of the first 20 Natural Numbers
  Count

A  =  210
  20

Average (A) of the first 20 Natural Numbers = 10.5

Sum of the first 20 Natural Numbers

  n    Nn  
  1    1  
  2    2  
  3    3  
  4    4  
  5    5  
  6    6  
  7    7  
  8    8  
  9    9  
  10    10  
  11    11  
  12    12  
  13    13  
  14    14  
  15    15  
  16    16  
  17    17  
  18    18  
  19    19  
  20    20  
Final Answer

S20 = 210
Average (A) of the first 20 Natural Numbers = 10.5


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Average (A) of the first 20 Natural Numbers = 10.5 $$", "name": null, "url": null, "image": null, "video": null}], "name": "Final Answer", "url": null, "image": null, "video": null }]} ], "totalTime": "", "supply": "" } }

What is the Answer?

S20 = 210
Average (A) of the first 20 Natural Numbers = 10.5

How does the Sum of the First (n) Numbers Calculator work?

Free Sum of the First (n) Numbers Calculator - Determines the sum of the first (n)
* Whole Numbers
* Natural Numbers
* Even Numbers
* Odd Numbers
* Square Numbers
* Cube Numbers
* Fourth Power Numbers
This calculator has 1 input.

What 7 formulas are used for the Sum of the First (n) Numbers Calculator?

Sum of the first n whole numbers = n(n - 1)/2
Sum of the first n natural numbers = n(n - 1)/2
Sum of the first n even numbers = n(n - 1)
Sum of the first n odd numbers = n2
Sum of the first n square numbers = n(n + 1)(2n + 1)/6
Sum of the first n cube numbers = n2(n + 1)2/4
Sum of the first n fourth power numbers = n(n + 1)(2n + 1)(3n2 + 3n - 1)/30

For more math formulas, check out our Formula Dossier

What 7 concepts are covered in the Sum of the First (n) Numbers Calculator?

even numbera whole number that is able to be divided by two into two equal whole numbersintegera whole number; a number that is not a fraction
...,-5,-4,-3,-2,-1,0,1,2,3,4,5,...natural numberthe positive integers (whole numbers)
1, 2, 3, ...odd numbera whole number that is not able to be divided by two into two equal whole numberssumthe total amount resulting from the addition of two or more numbers, amounts, or itemssum of the first (n) numberswhole numbernumbers that include natural numbers and zero
{0, 1, 2, 3, ...}

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