204 is the natural number

Natural number

In mathematics, the natural numbers are the ordinary whole numbers used for counting and ordering . These purposes are related to the linguistic notions of cardinal and ordinal numbers, respectively...

 following 203

203 (number)

203 is the natural number following 202 and preceding 204. It may be written as "two hundred three" or "two hundred and three".-In mathematics:203 is the 6th Bell number, i.e. it is the number of partitions of a set of size 6...

 and preceding 205

205 (number)

205 is the natural number following 204 and preceding 206. It may be written as "two hundred five" or "two hundred and five".-In other fields:* 205 Martha is a large Main belt asteroid....

. It may be written as "two hundred four" or "two hundred and four".

In mathematics

204 is the sum of consecutive primes in two different ways: as the sum of a twin prime (101 + 103) and as the sum of six consecutive primes (23 + 29 + 31 + 37 + 41 + 43).

204 is a refactorable number

Refactorable number

A refactorable number or tau number is an integer n that is divisible by the count of its divisors, or to put it algebraically, n is such that \tau|n. The first few refactorable numbers are listed in 1, 2, 8, 9, 12, 18, 24, 36, 40, 56, 60, 72, 80, 84, 88, 96...

 because it has 12 divisors, and 204 is divisible by 12.

As a figurate number, 204 is a nonagonal number and a square pyramidal number

Square pyramidal number

In mathematics, a pyramid number, or square pyramidal number, is a figurate number that represents the number of stacked spheres in a pyramid with a square base...

 (the sum of the first eight squares).

204 is a member of the Mian–Chowla sequence, being the smallest number after 182 such that the pairwise sums of the previous terms are all distinct.

204 is a Harshad number

Harshad number

A Harshad number, or Niven number in a given number base, is an integer that is divisible by the sum of its digits when written in that base. Harshad numbers were defined by D. R. Kaprekar, a mathematician from India. The word "Harshad" comes from the Sanskrit + , meaning joy-giver. The Niven...

 in base 10.

In other fields

• 204 is the HTTP status code indicating the request was received but there is no response to the request
• Not in Room 204 is a children's picture book about childhood sexual abuse, written by Shannon Riggs and illustrated by Jaime Zollars. Not in Room 204 received a starred review from the American Library Association's Booklist and won the 2007 Oregon Book Award for children's literature. It is published by Albert Whitman & Co (2007).