Properties of the Number 20789

Twenty Thousand Seven Hundred Eighty-Nine

Basics

Value: 20788 → 20789 → 20790

Parity: odd

Prime: Yes

Previous Prime: 20773

Next Prime: 20807

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 20789

Divisors: 1, 20789

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 101000100110101

Octal: 50465

Duodecimal: 10045

Hexadecimal: 5135

Square: 432182521

Square Root: 144.183910336764

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

Primes of form n² + 625. A256777

Prime time primes on 6-digit clocks, second definition: primes of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60. A295013

Primes p of the form 4·k+1 for which s=26 is the least positive integer such that s·p-(floor(sqrt(s·p)))² is a square. A145050

a(n) is the least number whose sum of digits in primorial base equals n. A343048

Consecutive states of the linear congruential pseudo-random number generator (741·s + 66037) mod 312500 when started at s=1. A385358

Place a point on the integer coordinates, up to |n|, along all four axial directions on a Cartesian plane, and then join an infinite straight line between every pair of points: a(n) is the number of points where lines intersect in the resulting graph. A386559

Table read by rows where i-th row consists of primes P of the form P=j·P(i)# -1 or P=j·P(i)# +1 with 0 < j < P(i+1). Here P(r)# = A002110. A87715

Primes q = 4·p+1, where p == 2 (mod 5) is also prime. A221981

Primes 8k + 5 preceding the maximal gaps in A269513. A269514

Primes of the form 11·n² + 55·n + 43. A292578