Properties of the Number 20459

Twenty Thousand Four Hundred Fifty-Nine

Basics

Value: 20458 → 20459 → 20460

Parity: odd

Prime: No

Previous Prime: 20443

Next Prime: 20477

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 41 × 499

Divisors: 1, 41, 499, 20459

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111111101011

Octal: 47753

Duodecimal: BA0B

Hexadecimal: 4feb

Square: 418570681

Square Root: 143.03496076134672

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

Composite and every divisor (except 1) contains the digit 4. A62670

T(n,k)=Number of nXk binary arrays with every 1 immediately preceded by 0 0 to the left or above. A203108

G.f.: 1/(1 - x²/(1 - x³/(1 - x⁵/(1 - x⁷/(1 - x¹¹/(1 - ... - x^prime(k)/(1 - ... ))))))), a continued fraction. A285407

The 4k+3 integers corresponding to the record positions in A165601. A166046

Coordination sequence for σ-CrFe, Position Xd. A9959

Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026907. A26918

Number of nX4 binary arrays with every 1 immediately preceded by 0 0 to the left or above. A203104

Number of nX6 binary arrays with every 1 immediately preceded by 0 0 to the left or above. A203106

a(n) is the sum of the terms of the symmetric square array defined by M(i,j) = prime(i)+i-j for i >= j and M(i,j) = M(j,i) if i < j. A308731

Numbers k such that the Reverse and Add! trajectory of k (presumably) does not reach a palindrome and does not join the trajectory or one of the reverse numbers of the trajectory of any term m < k. A306232