Properties of the Number 20489

Twenty Thousand Four Hundred Eighty-Nine

Basics

Value: 20488 → 20489 → 20490

Parity: odd

Prime: No

Previous Prime: 20483

Next Prime: 20507

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 7 × 2927

Divisors: 1, 7, 2927, 20489

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000000001001

Octal: 50011

Duodecimal: BA35

Hexadecimal: 5009

Square: 419799121

Square Root: 143.13979181206042

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

a(n) = a(n-2) + a(n-5). A1687

Number of integer partitions of n with no adjacent parts of quotient 2. A350837

Number of binary words of length n in which the ones occur only in blocks of length at least 4. A5253

Number of compositions of 5·n-3 into parts 2 and 5. A369843

Expansion of (1 + x)²/(1 - x²*(1 + x)³). A375317

a(n) = ∑_{k=0..floor(2·n/5)} binomial(2·n-3·k,2·k). A391541

G.f.: 1/(1 -2 x³ - x⁴ + x⁵). A122518

Number of length-n 0..7 arrays with no following elements greater than or equal to the first repeated value. A267231

Numbers k such that φ(k) divides sigma₀(k). A20489