### The Number

# 18

## Eightteen

## In Base 20 Vigesimal Is

# i20

The numbers with a 20 subscript use Base 20 Vigesimal notation.

For more familiar numbers: See Eightteen in Base 10 Decimal

## Nearby Numbers

*Positive, nonzero integers within three units*

## Scientific Notation

*Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.*

`1.8e1`

## Reciprocal

*A number multiplied with its reciprocal is one.*

`0.1248hfb248hfb620`

The reciprocal of 18 in Base 20 Vigesimal.

## Palindrome?

*A numerical palindrome has the same value when all of its digits are reversed.*

The number i20 is a palindrome.

## Not A Prime Number

*A prime number is a positive integer that is divisible only by itself and one.*

Eightteen is a composite number with 6 total factors (including 1 and itself). See primes in Base 20 Vigesimal

## A Composite

*Composites have more than just these two factors.*

Eightteen is a composite number with 6 total factors (including 1 and itself).

## Prime Factors

*The prime factors of a positive integer are the integers that divide it exactly and are also prime.*

The number eightteen has the following 2 prime factors:

## Prime Factorization

*The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities*

###
```
2201
·
3202
= i20
```

## Base Conversions

*The number eightteen in 35 different bases*