2420
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 8
- Digital Root
- 8
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 18
- Divisor Sum
- 5586
- Proper Divisor Sum (Aliquot Sum)
- 3166
- 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
- 880
- Möbius Function
- 0
- Radical
- 110
- Omega Function (Ω)
- 5
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 19
- 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
- Squares written in base 8.at n=35A002441
- a(n) = n^2 + prime(n).at n=46A004232
- Second pentagonal numbers: a(n) = n*(3*n + 1)/2.at n=40A005449
- Numbers k such that k^64 + 1 is prime.at n=25A006316
- Number of rooted bridgeless graphs with n nodes.at n=6A007145
- Coordination sequence T3 for Zeolite Code LAU.at n=35A008126
- Coordination sequence T3 for Zeolite Code LTN.at n=34A008142
- Coordination sequence T1 for Zeolite Code MAZ.at n=34A008144
- Coordination sequence T1 for feldspar.at n=33A008254
- a(n) = n^2*(n^2 - 1)/6.at n=11A008911
- Number of trees on n nodes with forbidden limbs.at n=9A014272
- Powers of fourth root of 17 rounded to nearest integer.at n=11A018094
- Powers of fourth root of 17 rounded up.at n=11A018095
- Number of lines through exactly 10 points of an n X n grid of points.at n=50A018817
- a(n) = (prime(n)^2 - 1)/24.at n=50A024702
- a(n) = (d(n)-r(n))/5, where d = A026040 and r is the periodic sequence with fundamental period (4,0,4,3,4).at n=30A026042
- a(n) = (d(n)-r(n))/5, where d = A026054 and r is the periodic sequence with fundamental period (3,3,0,0,4).at n=36A026056
- a_n = - sum_{i=1..n-1} C(i+1, n-i) (-1)^(n-i) a_i.at n=4A028380
- Number of triangles a queen can make (starting anywhere) on an n X n board.at n=11A030117
- Numbers with 18 divisors.at n=41A030636