204
domain: N
Properties
Digital Properties
- Digit Count
- 3
- Digit Sum
- 6
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 504
- Proper Divisor Sum (Aliquot Sum)
- 300
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 64
- Möbius Function
- 0
- Radical
- 102
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- yes
- Narcissistic Number
- no
- Collatz Steps
- 26
- Smith Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- yes
- Odd
- no
Names
- German
- zweihundertvier· ordinal: zweihundertvierste
- English
- two hundred four· ordinal: two hundred fourth
- Spanish
- doscientos cuatro· ordinal: 204º
- French
- deux cent quatre· ordinal: deux cent quatrième
- Italian
- duecentoquattro· ordinal: 204º
- Latin
- ducenti quattuor· ordinal: 204.
- Portuguese
- duzentos e quatro· ordinal: 204º
Appears in sequences
- Numbers k such that k^4 + 1 is prime.at n=30A000068
- Number of partitions into non-integral powers.at n=8A000135
- Square pyramidal numbers: a(n) = 0^2 + 1^2 + 2^2 + ... + n^2 = n*(n+1)*(2*n+1)/6.at n=8A000330
- A Beatty sequence: [ n(e+1) ].at n=54A000572
- Expansion of 1/((1-x)^2*(1-x^2)*(1-x^3)).at n=16A000601
- Number of free planar polyenoids with n nodes.at n=8A000942
- n! never ends in this many 0's.at n=39A000966
- Numbers that are divisible by at least three different primes.at n=31A000977
- Numbers that are the sum of 2 successive primes.at n=25A001043
- 9-gonal (or enneagonal or nonagonal) numbers: a(n) = n*(7*n-5)/2.at n=8A001106
- a(n)^2 is a triangular number: a(n) = 6*a(n-1) - a(n-2) with a(0)=0, a(1)=1.at n=4A001109
- Double-bitters: only even length runs in binary expansion.at n=10A001196
- Numbers of form m*k with m+1 <= k <= 2m-1.at n=56A001284
- a(n) = 1^n + 2^n + ... + 8^n.at n=2A001555
- Nearest integer to 2*n*log(n).at n=30A001618
- The coding-theoretic function A(n,4,3).at n=35A001839
- A Beatty sequence: floor(n * (sqrt(5) + 3)).at n=38A001962
- Numbers congruent to {2, 4, 8, 16} (mod 20).at n=41A002081
- Numbers k for which the rank of the elliptic curve y^2 = x^3 + k is 2.at n=28A002155
- Absolute value of Glaisher's beta'(2n+1).at n=17A002291