20805

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:
1 3 5 15 19 57 73 95 219 285 365 1095 1387 4161 6935 20805
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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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!

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