Properties of the Number 20534

Twenty Thousand Five Hundred Thirty-Four

Basics

Value: 20533 → 20534 → 20535

Parity: even

Prime: No

Previous Prime: 20533

Next Prime: 20543

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 × 10267

Divisors: 1, 2, 10267, 20534

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000000110110

Octal: 50066

Duodecimal: BA72

Hexadecimal: 5036

Square: 421645156

Square Root: 143.29689459300923

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) is the number of terms in the analog of A121805 but starting with n, or -1 if that sequence is infinite. A330128

Consider a number of k digits n = d_k*10^k-1 + d_k-1*10^k-2 + … + d₂*10 + d₁. Sequence lists the numbers n such that ∑_i=1..k-1{φ(∑_j=1..i{d_j*10^j-1})} = ∑_i=1..k-1{σ(∑_j=1..i{d_k-j+1*10^i-j})} (see example below). A244069

Upper (1/2,1/3) midsequence of (n²) and (n³); see Comments. A389583

a(1) = 1; a(n) = -∑_k=1..n a(k/gcd(n,k)). A343762

Least number k such that kⁿ + k +/- 1 are twin primes, or 0 if no such k exists. A248081

Array read by antidiagonals: T(m,n) is the number of maximal independent sets in the m X n king graph. A332347

a(n) = 8th Fibonacci polynomial evaluated at 2ⁿ. A20534