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Properties of the Number 20915

Twenty Thousand Nine Hundred Fifteen

Basics

Value: 20914 → 20915 → 20916

Parity: odd

Prime: No

Previous Prime: 20903

Next Prime: 20921

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 47 × 89

Divisors: 1, 5, 47, 89, 235, 445, 4183, 20915

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 101000110110011

Octal: 50663

Duodecimal: 1012B

Hexadecimal: 51b3

Square: 437437225

Square Root: 144.62019222777985

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 3k - 8 is prime. A217135
Numbers m having the same sum of divisors as m+20 has. A181647
Products of three distinct primes that form an arithmetic progression. A262723
For any number n take the polynomial formed by the product of the terms (x-π), where π's are the prime factors of n. Then calculate the area between the minimum and the maximum value of the prime factors. This sequence lists the numbers for which the area is equal to zero. A203614
Composite squarefree numbers k such that the arithmetic mean of the distinct prime factors of k is a prime p, and p divides k. A229094
The odd composites c such that c=q·g*j·y/2 and q+g=j·y where q,g,j,y are distinct primes. A167629
Nonnegative values·of solutions (x, y) to the Diophantine equation x2+(x+2737)2 = y2. A201916
Largest proper divisor of the n-th Carmichael number (A002997). A81703
Numbers·that are equal to lpf(x)*gpf(x)*(lpf(x)+gpf(x))/2, where lpf(x) < gpf(x) are the least and the greatest prime factors of x: A020639 and A006530. A307108
a(n) is the total number of movable letters in all members of the partitions of [n]. A367469