# d20

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

For more familiar numbers: See Thirteen in Base 10 Decimal

## Nearby Numbers

Positive, nonzero integers within three units

10
a20
Ten in Base 20 Vigesimal
11
b20
Eleven in Base 20 Vigesimal
12
c20
Twelve in Base 20 Vigesimal
14
e20
Fourteen in Base 20 Vigesimal
15
f20
Fifteen in Base 20 Vigesimal
16
g20
Sixteen in Base 20 Vigesimal

## Scientific Notation

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

## Reciprocal

A number multiplied with its reciprocal is one.

### `0.1af7dgi94c63220`

The reciprocal of 13 in Base 20 Vigesimal.

## Palindrome?

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

The number d20 is a palindrome.

## A Prime Number

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

Thirteen is the 6th prime number.   See primes in Base 20 Vigesimal

## Not A Composite

Composites have more than just these two factors.

Thirteen is not a composite number because it has exactly two factors: One and Thirteen

## Prime Factors

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

The number thirteen has the following 1 prime factor:

13
d20
Thirteen in Base 20 Vigesimal

## Prime Factorization

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

## Base Conversions

The number thirteen in 35 different bases