# 205

## 205 is an odd composite number composed of two prime numbers multiplied together.

What does the number 205 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

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

## Prime factorization of 205:

### 5 × 41

See below for interesting mathematical facts about the number 205 from the Numbermatics database.

### Names of 205

• Cardinal: 205 can be written as Two hundred five.

### Scientific notation

• Scientific notation: 2.05 × 102

### Factors of 205

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 46

### Divisors of 205

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 252
• Sum of proper divisors (its aliquot sum) s(n): 47
• 205 is a deficient number, because the sum of its proper divisors (47) is less than itself. Its deficiency is 158

### Bases of 205

• Binary: 110011012
• Base-36: 5P

### Squares and roots of 205

• 205 squared (2052) is 42025
• 205 cubed (2053) is 8615125
• The square root of 205 is 14.3178210633
• The cube root of 205 is 5.8963685399

### Scales and comparisons

How big is 205?
• 205 seconds is equal to 3 minutes, 25 seconds.
• To count from 1 to 205 would take you about forty-two seconds.

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 205 cubic inches would be around 0.5 feet tall.

### Recreational maths with 205

• 205 backwards is 502
• The number of decimal digits it has is: 3
• The sum of 205's digits is 7
• More coming soon!