Properties of the Number 20485

Twenty Thousand Four Hundred Eighty-Five

Basics

Value: 20484 → 20485 → 20486

Parity: odd

Prime: No

Previous Prime: 20483

Next Prime: 20507

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 17 × 241

Divisors: 1, 5, 17, 85, 241, 1205, 4097, 20485

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000000000101

Octal: 50005

Duodecimal: BA31

Hexadecimal: 5005

Square: 419635225

Square Root: 143.1258187749506

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

Palindromic numbers in bases 2 and 8 written in base 10. A259380

Palindromic numbers in bases 4 and 8 written in base 10. A259382

Numbers n palindromic in exactly three bases b, 2 <= b <= 10. A214425

Subgroups of nimber addition interpreted as binary numbers. A190939

Family 1 "Rule 90·Rule 150 Array" read by antidiagonals. A48710

Positive numbers such that both their binary and negabinary representations are palindromic. A331894

a(n) is the smallest index m such that ∑_k=2..m 1/PrimePi(k) >= n, where PrimePi()=A000720(). A74633

Ulam's spiral (ESE spoke). A143855

Numbers k such that 2^2k-1 == 2 (mod 2k) and such that 2^k-1 ≠ 1 (mod k). A176033

a(n) = 5·2ⁿ + 5. A231643