20,391 is an odd composite number composed of three prime numbers multiplied together.

What does the number 20391 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

20391 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

Prime factorization of 20391:

3 × 7 × 971

See below for interesting mathematical facts about the number 20391 from the Numbermatics database.

Names of 20391

  • Cardinal: 20391 can be written as Twenty thousand, three hundred ninety-one.

Scientific notation

  • Scientific notation: 2.0391 × 104

Factors of 20391

  • Number of distinct prime factors ω(n): 3
  • Total number of prime factors Ω(n): 3
  • Sum of prime factors: 981

Divisors of 20391

  • Number of divisors d(n): 8
  • Complete list of divisors:
  • Sum of all divisors σ(n): 31104
  • Sum of proper divisors (its aliquot sum) s(n): 10713
  • 20391 is a deficient number, because the sum of its proper divisors (10713) is less than itself. Its deficiency is 9678

Bases of 20391

  • Binary: 1001111101001112
  • Hexadecimal: 0x4FA7
  • Base-36: FQF

Squares and roots of 20391

  • 20391 squared (203912) is 415792881
  • 20391 cubed (203913) is 8478432636471
  • The square root of 20391 is 142.7970587931
  • The cube root of 20391 is 27.3199253429

Scales and comparisons

How big is 20391?
  • 20,391 seconds is equal to 5 hours, 39 minutes, 51 seconds.
  • To count from 1 to 20,391 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 20391 cubic inches would be around 2.3 feet tall.

Recreational maths with 20391

  • 20391 backwards is 19302
  • The number of decimal digits it has is: 5
  • The sum of 20391's digits is 15
  • More coming soon!

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"Number 20391 - Facts about the integer". Numbermatics.com. 2023. Web. 11 December 2023.

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Numbermatics. (2023). Number 20391 - Facts about the integer. Retrieved 11 December 2023, from https://numbermatics.com/n/20391/

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Numbermatics. 2023. "Number 20391 - Facts about the integer". https://numbermatics.com/n/20391/

The information we have on file for 20391 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 20391, math, Factors of 20391, curriculum, school, college, exams, university, Prime factorization of 20391, STEM, science, technology, engineering, physics, economics, calculator, twenty thousand, three hundred ninety-one.

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