Properties of the Number 17820

Seventeen Thousand Eight Hundred Twenty

Basics

Value: 17819 → 17820 → 17821

Parity: even

Prime: No

Previous Prime: 17807

Next Prime: 17827

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ⁴ × 5 × 11

Divisors: 1, 2, 3, 4, 5, 6, 9, 10, 11, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100010110011100

Octal: 42634

Duodecimal: A390

Hexadecimal: 459c

Square: 317552400

Square Root: 133.49157276772192

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

Numbers k such that k and 4·k are anagrams. A23088

Numbers k which have a factorization k = f1·f2*...*fr where the digits of {k, f1, f2, ..., fr} together give 0,1,...,9 exactly once. A370970

Number of partitions of n with exactly four part sizes. A365630

Dirichlet convolution of Fibonacci numbers with φ(n). A34748

Numbers j such that j divides the sum of the digits of j!. A108825

Number of 5-way intersections in the interior of a regular 6n-gon. A137939

Numbers with prime factorization pqr^2s^4. A190107

Sum of all the parts in the partitions of n into 5 parts. A308822

Irregular table read by rows: Take a nonagon with all diagonals drawn, as in A332421. Then T(n,k) = number of k-sided polygons in that figure for k >= 3. A332427

Composite numbers with properties that its digits (which may appear with multiplicity) may not appear in any of its factors (wherein the digits may also appear with multiplicity) and the combined digits of the product and the factors must have at least one of each of the ten digits. A370972