19811

19,811 is an odd composite number composed of two prime numbers multiplied together.

What does the number 19811 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

19811 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

Prime factorization of 19811:

11 × 1801

See below for interesting mathematical facts about the number 19811 from the Numbermatics database.


Names of 19811

  • Cardinal: 19811 can be written as Nineteen thousand, eight hundred eleven.

Scientific notation

  • Scientific notation: 1.9811 × 104

Factors of 19811

  • Number of distinct prime factors ω(n): 2
  • Total number of prime factors Ω(n): 2
  • Sum of prime factors: 1812

Divisors of 19811

  • Number of divisors d(n): 4
  • Complete list of divisors:
  • Sum of all divisors σ(n): 21624
  • Sum of proper divisors (its aliquot sum) s(n): 1813
  • 19811 is a deficient number, because the sum of its proper divisors (1813) is less than itself. Its deficiency is 17998

Bases of 19811

  • Binary: 1001101011000112
  • Hexadecimal: 0x4D63
  • Base-36: FAB

Squares and roots of 19811

  • 19811 squared (198112) is 392475721
  • 19811 cubed (198113) is 7775336508731
  • The square root of 19811 is 140.7515541655
  • The cube root of 19811 is 27.0584012499

Scales and comparisons

How big is 19811?
  • 19,811 seconds is equal to 5 hours, 30 minutes, 11 seconds.
  • To count from 1 to 19,811 would take you about five hours.

    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 19811 cubic inches would be around 2.3 feet tall.

Recreational maths with 19811

  • 19811 backwards is 11891
  • The number of decimal digits it has is: 5
  • The sum of 19811's digits is 20
  • More coming soon!

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"Number 19811 - Facts about the integer". Numbermatics.com. 2020. Web. 4 April 2020.

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Numbermatics. (2020). Number 19811 - Facts about the integer. Retrieved 4 April 2020, from https://numbermatics.com/n/19811/

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The information we have on file for 19811 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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