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Properties of the Number 20128

Twenty Thousand One Hundred Twenty-Eight

Basics

Value: 20127 → 20128 → 20129

Parity: even

Prime: No

Previous Prime: 20123

Next Prime: 20129

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 5 × 17 × 37

Divisors: 1, 2, 4, 8, 16, 17, 32, 34, 37, 68

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 100111010100000

Octal: 47240

Duodecimal: B794

Hexadecimal: 4ea0

Square: 405136384

Square Root: 141.8731828077456

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of strict chains of divisors from n! to 1. A337105
Number of n-bead bracelets (turnover necklaces) of two colors with 6 red beads and n-6 black beads. A5513
T(n,k)=Number of length n+4 0..k arrays with every five consecutive terms having two times the sum of some three elements equal to three times the sum of the remaining two. A248987
Numbers which are representable as a sum of seventeen but no fewer consecutive nonnegative integers. A270302
a(n) is the smallest number which has a water-capacity of n. A275339
T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum minus the lower median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one. A238311
Fibonacci + Goldbach: a(1)=6, a(2)=8 and for n>=3, a(n)=g(a(n-1)) + g(a(n-2)), where for m>=3, g(2·m) is the maximal prime p < 2·m such that 2·m - p is prime. A216275
Infinite square array, where row r >= 0 is the orbit of r under the map A380873: concatenate(sum of digits, product of digits). A380872
Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)k, where B(x) is the e.g.f. of A384691. A384692
Shifts 4 places left under Dirichlet convolution. A144368