# 18420660721

## 18,420,660,721 is an odd composite number composed of two prime numbers multiplied together.

What does the number 18420660721 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 16 divisors.

18420660721 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of sixteen divisors.

## Prime factorization of 18420660721:

### 193 × 1393

(19 × 19 × 19 × 139 × 139 × 139)

See below for interesting mathematical facts about the number 18420660721 from the Numbermatics database.

### Names of 18420660721

• Cardinal: 18420660721 can be written as Eighteen billion, four hundred twenty million, six hundred sixty thousand, seven hundred twenty-one.

### Scientific notation

• Scientific notation: 1.8420660721 × 1010

### Factors of 18420660721

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 158

### Divisors of 18420660721

• Number of divisors d(n): 16
• Complete list of divisors:
• Sum of all divisors σ(n): 19584779200
• Sum of proper divisors (its aliquot sum) s(n): 1164118479
• 18420660721 is a deficient number, because the sum of its proper divisors (1164118479) is less than itself. Its deficiency is 17256542242

### Bases of 18420660721

• Binary: 100010010011111010011111001111100012
• Base-36: 8GN6OS1

### Squares and roots of 18420660721

• 18420660721 squared (184206607212) is 339320741398192239841
• 18420660721 cubed (184206607213) is 6250512252894278412846119985361
• The square root of 18420660721 is 135722.7347241427
• 18420660721 is a perfect cube number. Its cube root is 2641

### Scales and comparisons

How big is 18420660721?
• 18,420,660,721 seconds is equal to 585 years, 37 weeks, 3 days, 2 hours, 12 minutes, 1 second.
• To count from 1 to 18,420,660,721 would take you about one thousand, one hundred seventy-one years!

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 18420660721 cubic inches would be around 220.1 feet tall.

### Recreational maths with 18420660721

• 18420660721 backwards is 12706602481
• The number of decimal digits it has is: 11
• The sum of 18420660721's digits is 37
• More coming soon!