17620
domain: N
Properties
Digital Properties
- Digit Count
- 5
- Digit Sum
- 16
- Digital Root
- 7
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 1
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 37044
- Proper Divisor Sum (Aliquot Sum)
- 19424
- Abundant Number
- yes
- Perfect Number
- no
- Deficient Number
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 7040
- Möbius Function
- 0
- Radical
- 8810
- 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
- no
- Narcissistic Number
- no
- Collatz Steps
- 97
- 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
- T(n,n-2), array T as in A047030.at n=8A047034
- Write 0, 1, ..., n in base 3 and add as if they were decimal numbers.at n=40A121718
- Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+881)^2 = y^2.at n=6A130014
- Number of partitions of n such that (maximal multiplicity of parts) = (multiplicity of the least part).at n=38A240303
- Expansion of Product_{k>=1} (1 + x^(3*k-1))^(3*k-1).at n=35A262948
- Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 790", based on the 5-celled von Neumann neighborhood.at n=31A273562
- Number of regions formed when every pair of vertices of a regular n-gon are joined by an infinite line.at n=20A345025
- Numbers k such that the largest unitary divisor of sigma(k) that is coprime with A003961(k) is also a unitary divisor of k.at n=47A351551
- The total length of the sequence when starting from n and creating the smallest unused prime number by either removing or adding a single digit anywhere in the value of the previous number. If the sequence does not terminate, a(n) = -1.at n=18A389927
- Expansion of g^2/(1 + x^3*g), where g = 1+x*g^4 is the g.f. of A002293.at n=6A391454
- Expansion of 1 / ((1-x)^5 - x^3)^2.at n=7A392586