1820

1,820 is an even composite number composed of four prime numbers multiplied together.

What does the number 1820 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 24 divisors.

1820 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of twenty-four divisors.

Prime factorization of 1820:

22 × 5 × 7 × 13

(2 × 2 × 5 × 7 × 13)

See below for interesting mathematical facts about the number 1820 from the Numbermatics database.


Names of 1820

  • Cardinal: 1820 can be written as One thousand, eight hundred twenty.

Scientific notation

  • Scientific notation: 1.82 × 103

Factors of 1820

  • Number of distinct prime factors ω(n): 4
  • Total number of prime factors Ω(n): 5
  • Sum of prime factors: 27

Divisors of 1820

  • Number of divisors d(n): 24
  • Complete list of divisors:
  • Sum of all divisors σ(n): 4704
  • Sum of proper divisors (its aliquot sum) s(n): 2884
  • 1820 is an abundant number, because the sum of its proper divisors (2884) is greater than itself. Its abundance is 1064

Bases of 1820

  • Binary: 111000111002
  • Hexadecimal: 0x71C
  • Base-36: 1EK

Squares and roots of 1820

  • 1820 squared (18202) is 3312400
  • 1820 cubed (18203) is 6028568000
  • The square root of 1820 is 42.6614580151
  • The cube root of 1820 is 12.2092914975

Scales and comparisons

How big is 1820?
  • 1,820 seconds is equal to 30 minutes, 20 seconds.
  • To count from 1 to 1,820 would take you about thirty minutes.

    This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

  • A cube with a volume of 1820 cubic inches would be around 1 feet tall.

Recreational maths with 1820

  • 1820 backwards is 0281
  • The number of decimal digits it has is: 4
  • The sum of 1820's digits is 11
  • More coming soon!

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"Number 1820 - Facts about the integer". Numbermatics.com. 2020. Web. 1 December 2020.

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The information we have on file for 1820 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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