Properties of the Number 22648

Twenty-Two Thousand Six Hundred Forty-Eight

Basics

Value: 22647 → 22648 → 22649

Parity: even

Prime: No

Previous Prime: 22643

Next Prime: 22651

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 19 × 149

Divisors: 1, 2, 4, 8, 19, 38, 76, 149, 152, 298

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101100001111000

Octal: 54170

Duodecimal: 11134

Hexadecimal: 5878

Square: 512931904

Square Root: 150.49252473129687

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

Triangle read by rows: the almost-Riordan array ( 1/(1-x) | 2/((1-x)*(1+x+sqrt(5·x²-6·x+1))), (1-3·x-sqrt(5·x²-6·x+1))/(2x) ). A373746

Composite numbers k such that σ(k)*(φ(k) + 2) is a square. A65655

a(n) = prime(n)*(prime(n+1) + 1). A123134

Integers k that have the property that there exists an integer·with n+1 digits, such that 1 <= k/x < 2 and k/x = 1 + (x-10ⁿ)/(10ⁿ-1), i.e., the same digits appear in the denominator and in the recurring decimal. A288782

a(n) = (7·n+2)*(7·n+5) = 49·n² + 49·n + 10. A177060

The indices where A354606(n) = 1. A355606

G.f. A(x) satisfies A(x) = 1/(1 - x) + x·A(x)³/(1 - x)². A366177

Least m such that both p∣m and p+2∣m+2 for twin prime pairs (p,p+2) (p=A001359). A97972

Numbers k such that 4·10^k - 11 is prime. A102738

Expansion of ∏_m>=1 (1 + m·q^m)²⁰. A22648