18720

18,720 is an even composite number composed of four prime numbers multiplied together.

What does the number 18720 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 72 divisors.

18720 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of seventy-two divisors.

Prime factorization of 18720:

25 × 32 × 5 × 13

(2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 × 13)

See below for interesting mathematical facts about the number 18720 from the Numbermatics database.

Names of 18720

• Cardinal: 18720 can be written as Eighteen thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 1.872 × 104

Factors of 18720

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 23

Divisors of 18720

• Number of divisors d(n): 72
• Complete list of divisors:
• Sum of all divisors σ(n): 68796
• Sum of proper divisors (its aliquot sum) s(n): 50076
• 18720 is an abundant number, because the sum of its proper divisors (50076) is greater than itself. Its abundance is 31356

Bases of 18720

• Binary: 1001001001000002
• Base-36: EG0

Squares and roots of 18720

• 18720 squared (187202) is 350438400
• 18720 cubed (187203) is 6560206848000
• The square root of 18720 is 136.8210510119
• The cube root of 18720 is 26.5522878853

Scales and comparisons

How big is 18720?
• 18,720 seconds is equal to 5 hours, 12 minutes.
• To count from 1 to 18,720 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 18720 cubic inches would be around 2.2 feet tall.

Recreational maths with 18720

• 18720 backwards is 02781
• 18720 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 18720's digits is 18
• More coming soon!