# 1911

The numbers with a 11 subscript use Base 11 Undecimal notation.

For more familiar numbers: See Twenty in Base 10 Decimal

## Nearby Numbers

Positive, nonzero integers within three units

17
1611
Seventeen in Base 11 Undecimal
18
1711
Eightteen in Base 11 Undecimal
19
1811
Nineteen in Base 11 Undecimal
21
1a11
Twenty-One in Base 11 Undecimal
22
2011
Twenty-Two in Base 11 Undecimal
23
2111
Twenty-Three in Base 11 Undecimal

## 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.

### `0.0606060606060606411`

The reciprocal of 20 in Base 11 Undecimal.

## Palindrome?

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

The number 1911 is not a palindrome.

## Not A Prime Number

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

Twenty is a composite number with 6 total factors (including 1 and itself).   See primes in Base 11 Undecimal

## A Composite

Composites have more than just these two factors.

Twenty 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 twenty has the following 2 prime factors:

2
211
Two in Base 11 Undecimal
5
511
Five in Base 11 Undecimal

## Prime Factorization

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

## Base Conversions

The number twenty in 35 different bases