20,809 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 20809 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

20809 is a prime number. Like all primes (except two), it is an odd number.

Prime factorization of 20809:


See below for interesting mathematical facts about the number 20809 from the Numbermatics database.

Names of 20809

  • Cardinal: 20809 can be written as Twenty thousand, eight hundred nine.

Scientific notation

  • Scientific notation: 2.0809 × 104

Factors of 20809

  • Number of distinct prime factors ω(n): 1
  • Total number of prime factors Ω(n): 1
  • Sum of prime factors: 20809

Divisors of 20809

  • Number of divisors d(n): 2
  • Complete list of divisors:
  • Sum of all divisors σ(n): 20810
  • Sum of proper divisors (its aliquot sum) s(n): 1
  • 20809 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 20808

Bases of 20809

  • Binary: 1010001010010012
  • Hexadecimal: 0x5149
  • Base-36: G21

Squares and roots of 20809

  • 20809 squared (208092) is 433014481
  • 20809 cubed (208093) is 9010598335129
  • The square root of 20809 is 144.2532495301
  • The cube root of 20809 is 27.5053433143

Scales and comparisons

How big is 20809?
  • 20,809 seconds is equal to 5 hours, 46 minutes, 49 seconds.
  • To count from 1 to 20,809 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 20809 cubic inches would be around 2.3 feet tall.

Recreational maths with 20809

  • 20809 backwards is 90802
  • The number of decimal digits it has is: 5
  • The sum of 20809's digits is 19
  • More coming soon!

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"Number 20809 - Facts about the integer". Numbermatics.com. 2023. Web. 4 October 2023.

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Numbermatics. (2023). Number 20809 - Facts about the integer. Retrieved 4 October 2023, from https://numbermatics.com/n/20809/

Chicago style:
Numbermatics. 2023. "Number 20809 - Facts about the integer". https://numbermatics.com/n/20809/

The information we have on file for 20809 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!

Keywords: Divisors of 20809, math, Factors of 20809, curriculum, school, college, exams, university, Prime factorization of 20809, STEM, science, technology, engineering, physics, economics, calculator, twenty thousand, eight hundred nine.

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