Base | Representation |
---|---|
bin | 100110111110… |
… | …0001010111011 |
3 | 1102110000210222 |
4 | 1031330022323 |
5 | 20212302142 |
6 | 2005530255 |
7 | 335444123 |
oct | 115741273 |
9 | 42400728 |
10 | 20431547 |
11 | 10595584 |
12 | 6a1398b |
13 | 4304996 |
14 | 29dbc83 |
15 | 1bd8bd2 |
hex | 137c2bb |
20431547 has 2 divisors, whose sum is σ = 20431548. Its totient is φ = 20431546.
The previous prime is 20431451. The next prime is 20431549. The reversal of 20431547 is 74513402.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 20431547 - 214 = 20415163 is a prime.
It is a super-2 number, since 2×204315472 = 834896225626418, which contains 22 as substring.
Together with 20431549, it forms a pair of twin primes.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (20431549) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215773 + 10215774.
It is an arithmetic number, because the mean of its divisors is an integer number (10215774).
Almost surely, 220431547 is an apocalyptic number.
20431547 is a deficient number, since it is larger than the sum of its proper divisors (1).
20431547 is an equidigital number, since it uses as much as digits as its factorization.
20431547 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 3360, while the sum is 26.
The square root of 20431547 is about 4520.1268787502. The cubic root of 20431547 is about 273.3802168570.
Adding to 20431547 its reverse (74513402), we get a palindrome (94944949).
The spelling of 20431547 in words is "twenty million, four hundred thirty-one thousand, five hundred forty-seven".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.000 sec. • engine limits •