Properties of the Number 20552

Twenty Thousand Five Hundred Fifty-Two

Basics

Value: 20551 → 20552 → 20553

Parity: even

Prime: No

Previous Prime: 20551

Next Prime: 20563

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ³ × 7 × 367

Divisors: 1, 2, 4, 7, 8, 14, 28, 56, 367, 734

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 101000001001000

Octal: 50110

Duodecimal: BA88

Hexadecimal: 5048

Square: 422384704

Square Root: 143.3596874996594

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) = ∑_{k=0..floor(n/2)} binomial(k,2*(n-2·k)). A392250

Number of permutations of [n] that either have a fixed point or a succession, but not both. A207821

G.f. satisfies A(x) = 1 + x·A(x * (1 - x)). A360894

Number of compositions of 5·n-1 into parts 4 and 5. A369849

Numbers k such that 33·2^k - 1 is prime. A2240

Integers n > 10553 such that the 'Reverse and Add!' trajectory of n joins the trajectory of 10553. A63061

Times in hours, minutes and seconds (to the nearest second) at which the hour and minute hands of an analog clock, if interchanged, continue to indicate some other albeit accurate times, over a complete 12-hour sweep for the slower hand. Leading zeros omitted. A121577

a(n) = 4·a(n-1) - 6·a(n-2) + 4·a(n-3) - a(n-4) + a(n-5) with a(1) = a(2) = a(3) = 0, a(4) = 1, and a(5) = 3. A385142

BINOMIAL transform of A090351. A111342

Number of binary strings of length n with equal numbers of 00010 and 11000 substrings. A164224