Base | Representation |
---|---|
bin | 10011000000010000… |
… | …001011010011011001 |
3 | 1221200002020102200200 |
4 | 103000100023103121 |
5 | 313242231212012 |
6 | 13212445052413 |
7 | 1321443326226 |
oct | 230020132331 |
9 | 57602212620 |
10 | 20405335257 |
11 | 872130943a |
12 | 3b55857109 |
13 | 1c02666798 |
14 | db807894d |
15 | 7e66353dc |
hex | 4c040b4d9 |
20405335257 has 24 divisors (see below), whose sum is σ = 30155274240. Its totient is φ = 13292847360.
The previous prime is 20405335217. The next prime is 20405335267. The reversal of 20405335257 is 75253350402.
20405335257 is a `hidden beast` number, since 20 + 4 + 0 + 533 + 52 + 57 = 666.
It is not a de Polignac number, because 20405335257 - 26 = 20405335193 is a prime.
It is not an unprimeable number, because it can be changed into a prime (20405335207) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78969 + ... + 216902.
It is an arithmetic number, because the mean of its divisors is an integer number (1256469760).
Almost surely, 220405335257 is an apocalyptic number.
It is an amenable number.
20405335257 is a deficient number, since it is larger than the sum of its proper divisors (9749938983).
20405335257 is a wasteful number, since it uses less digits than its factorization.
20405335257 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 296053 (or 296050 counting only the distinct ones).
The product of its (nonzero) digits is 126000, while the sum is 36.
Adding to 20405335257 its reverse (75253350402), we get a palindrome (95658685659).
The spelling of 20405335257 in words is "twenty billion, four hundred five million, three hundred thirty-five thousand, two hundred fifty-seven".
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