Properties of the Number 20027

Twenty Thousand Twenty-Seven

Basics

Value: 20026 → 20027 → 20028

Parity: odd

Prime: No

Previous Prime: 20023

Next Prime: 20029

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 7 × 2861

Divisors: 1, 7, 2861, 20027

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111000111011

Octal: 47073

Duodecimal: B70B

Hexadecimal: 4e3b

Square: 401080729

Square Root: 141.5167834569455

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

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..2 introduced in row major order. A231219

a(n) = ∑_d∣n pxi(d), where pxi(m) is the product of totatives of m (A001783). A280258

Number of nondecreasing -2..2 vectors of length n whose dot product with some other -2..2 vector equals n. A226334

Index where n first appears in A381597. A381599

a(0) = 1; thereafter a(n) = 10·n² - 5·n + 2. A383466

Number of (n+1) X (4+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..2 introduced in row major order. A231215

Number of (n+1)X(5+1) 0..2 arrays with no element unequal to a strict majority of its horizontal and vertical neighbors, with values 0..2 introduced in row major order. A231216

Nearest integer to γ(n + 3/8)/γ(3/8). A20027