21385520

21,385,520 is an even composite number composed of four prime numbers multiplied together.

What does the number 21385520 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 40 divisors.

21385520 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of forty divisors.

Prime factorization of 21385520:

2⁴ × 5 × 13 × 20563

(2 × 2 × 2 × 2 × 5 × 13 × 20563)

See below for interesting mathematical facts about the number 21385520 from the Numbermatics database.

Names of 21385520

Cardinal: 21385520 can be written as Twenty-one million, three hundred eighty-five thousand, five hundred twenty.

Scientific notation

Scientific notation: 2.138552 × 10⁷

Factors of 21385520

Number of distinct prime factors ω(n): 4
Total number of prime factors Ω(n): 7
Sum of prime factors: 20583

Divisors of 21385520

Number of divisors d(n): 40
Complete list of divisors:
1 2 4 5 8 10 13 16 20 26 40 52 65 80 104 130 208 260 520 1040 20563 41126 82252 102815 164504 205630 267319 329008 411260 534638 822520 1069276 1336595 1645040 2138552 2673190 4277104 5346380 10692760 21385520
Sum of all divisors σ(n): 53548656
Sum of proper divisors (its aliquot sum) s(n): 32163136
21385520 is an abundant number, because the sum of its proper divisors (32163136) is greater than itself. Its abundance is 10777616

Bases of 21385520

Binary: 1010001100101000100110000₂
Hexadecimal: 0x1465130
Base-36: CQD68

Squares and roots of 21385520

21385520 squared (21385520²) is 457340465670400
21385520 cubed (21385520³) is 9780463675403652608000
The square root of 21385520 is 4624.4480751761
The cube root of 21385520 is 277.5704769185

Scales and comparisons

How big is 21385520?

21,385,520 seconds is equal to 35 weeks, 2 days, 12 hours, 25 minutes, 20 seconds.
To count from 1 to 21,385,520 would take you about six 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 21385520 cubic inches would be around 23.1 feet tall.

Recreational maths with 21385520

21385520 backwards is 02558312
21385520 is a Harshad number.
The number of decimal digits it has is: 8
The sum of 21385520's digits is 26
More coming soon!

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The information we have on file for 21385520 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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