# 20

## 20 is an even composite number composed of two prime numbers multiplied together.

What does the number 20 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

20 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

## Prime factorization of 20:

### 22 × 5

(2 × 2 × 5)

See below for interesting mathematical facts about the number 20 from the Numbermatics database.

### Names of 20

• Cardinal: 20 can be written as Twenty.

### Scientific notation

• Scientific notation: 2 × 101

### Factors of 20

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 7

### Divisors of 20

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 42
• Sum of proper divisors (its aliquot sum) s(n): 22
• 20 is an abundant number, because the sum of its proper divisors (22) is greater than itself. Its abundance is 2

### Bases of 20

• Binary: 101002
• Base-36: K

### Squares and roots of 20

• 20 squared (202) is 400
• 20 cubed (203) is 8000
• The square root of 20 is 4.4721359549
• The cube root of 20 is 2.7144176165

### Scales and comparisons

How big is 20?
• A cube with a volume of 20 cubic inches would be around 0.2 feet tall.

### Recreational maths with 20

• 20 backwards is 02
• 20 is a Harshad number.
• The number of decimal digits it has is: 2
• The sum of 20's digits is 2
• More coming soon!