20,805 is an odd composite number composed of four prime numbers multiplied together.

What does the number 20805 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 16 divisors.

20805 is an odd composite number. It is composed of four distinct prime numbers multiplied together. It has a total of sixteen divisors.

Prime factorization of 20805:

3 × 5 × 19 × 73

See below for interesting mathematical facts about the number 20805 from the Numbermatics database.

Names of 20805

  • Cardinal: 20805 can be written as Twenty thousand, eight hundred five.

Scientific notation

  • Scientific notation: 2.0805 × 104

Factors of 20805

  • Number of distinct prime factors ω(n): 4
  • Total number of prime factors Ω(n): 4
  • Sum of prime factors: 100

Divisors of 20805

  • Number of divisors d(n): 16
  • Complete list of divisors:
  • Sum of all divisors σ(n): 35520
  • Sum of proper divisors (its aliquot sum) s(n): 14715
  • 20805 is a deficient number, because the sum of its proper divisors (14715) is less than itself. Its deficiency is 6090

Bases of 20805

  • Binary: 1010001010001012
  • Hexadecimal: 0x5145
  • Base-36: G1X

Squares and roots of 20805

  • 20805 squared (208052) is 432848025
  • 20805 cubed (208053) is 9005403160125
  • The square root of 20805 is 144.2393843581
  • The cube root of 20805 is 27.5035808007

Scales and comparisons

How big is 20805?
  • 20,805 seconds is equal to 5 hours, 46 minutes, 45 seconds.
  • To count from 1 to 20,805 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 20805 cubic inches would be around 2.3 feet tall.

Recreational maths with 20805

  • 20805 backwards is 50802
  • 20805 is a Harshad number.
  • The number of decimal digits it has is: 5
  • The sum of 20805's digits is 15
  • More coming soon!

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"Number 20805 - Facts about the integer". Numbermatics.com. 2023. Web. 22 March 2023.

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Numbermatics. (2023). Number 20805 - Facts about the integer. Retrieved 22 March 2023, from https://numbermatics.com/n/20805/

Chicago style:
Numbermatics. 2023. "Number 20805 - Facts about the integer". https://numbermatics.com/n/20805/

The information we have on file for 20805 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 20805, math, Factors of 20805, curriculum, school, college, exams, university, Prime factorization of 20805, STEM, science, technology, engineering, physics, economics, calculator, twenty thousand, eight hundred five.

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