2020
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 4
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 4284
- Proper Divisor Sum (Aliquot Sum)
- 2264
- 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
- 800
- Möbius Function
- 0
- Radical
- 1010
- 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
- 63
- Smith Number
- no
- Vampire 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
Appears in sequences
- Number of compositions of n into 4 ordered relatively prime parts.at n=21A000742
- Solid partitions of n, distinct along rows.at n=10A002936
- Coordination sequence T1 for Zeolite Code AFI.at n=31A008014
- Coordination sequence T1 for Zeolite Code ANA.at n=29A008031
- Coordination sequence T1 for Zeolite Code VSV.at n=29A009914
- Representation of n in base of Catalan numbers (a classic greedy version).at n=32A014418
- Number of partitions of n into distinct parts, none being 7.at n=48A015754
- Expansion of 1/(1-x^3-x^4-x^5-x^6).at n=28A017819
- Powers of sqrt(21) rounded down.at n=5A017967
- Powers of fourth root of 21 rounded down.at n=10A018105
- Number of lines through exactly 8 points of an n X n grid of points.at n=40A018815
- Coordination sequence T2 for Zeolite Code CZP.at n=29A019457
- Doublets: base-10 representation is the juxtaposition of two identical strings.at n=19A020338
- Index of 5^n within sequence of numbers of form 2^i * 5^j.at n=41A022334
- a(n) = prime(n)*prime(n-1) - 1.at n=14A023515
- n written in fractional base 4/2.at n=20A024630
- a(n) = greatest number in row n of A026098 that is not a positive power of 2.at n=42A026104
- a(n) = sum of the numbers between the two n's in A026366.at n=23A026369
- a(n) = n^2 - 5.at n=45A028875
- Numbers k such that k^2 has only even digits.at n=35A030097