Properties of the Number 19420

Nineteen Thousand Four Hundred Twenty

Basics

Value: 19419 → 19420 → 19421

Parity: even

Prime: No

Previous Prime: 19417

Next Prime: 19421

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 971

Divisors: 1, 2, 4, 5, 10, 20, 971, 1942, 3884, 4855

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100101111011100

Octal: 45734

Duodecimal: B2A4

Hexadecimal: 4bdc

Square: 377136400

Square Root: 139.35566009315875

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

Let S denote the palindromes in the language {0,1}*; a(n) = number of words of length n in the language SS. A7055

T(n,k) = Number of (n+2) X (k+2) binary arrays avoiding patterns 000 and 101 in rows, columns and nw-to-se diagonals. A202532

Number of 2n-bead balanced binary strings, rotationally equivalent to reverse, complement and reversed complement. A45656

Numbers k such that k+1, k+3, k+7 and k+9 are all primes. A125855

Numbers m such that m+1, m+3, m+7, m+9 and m+13 are all primes. A245304

Triangle of coefficients of polynomials v(n,x) jointly generated with A209773; see the Formula section. A209774

Numbers k such that A090086(k), the smallest pseudoprime to base k (not necessarily exceeding k), is a Carmichael number. A293203

a(n) = 12·a(n-1) - 34·a(n-2) for n > 1; a(0) = 1, a(1) = 7. A163458

Number of (n+2) X 3 binary arrays avoiding patterns 000 and 101 in rows, columns and nw-to-se diagonals. A202525

Number of binary strings of length n having a cyclic shift that is a palindrome. A245582