Base | Representation |
---|---|
bin | 10010101000011011… |
… | …001000110011001101 |
3 | 1220122012222111211111 |
4 | 102220123020303031 |
5 | 311432410233110 |
6 | 13105044252021 |
7 | 1305520262263 |
oct | 225033106315 |
9 | 56565874744 |
10 | 20005555405 |
11 | 8536683970 |
12 | 3a639a1011 |
13 | 1b6a8a1464 |
14 | d7ad30433 |
15 | 7c14b6e8a |
hex | 4a86c8ccd |
20005555405 has 32 divisors (see below), whose sum is σ = 26773037568. Its totient is φ = 14225702400.
The previous prime is 20005555363. The next prime is 20005555417. The reversal of 20005555405 is 50455550002.
It is not a de Polignac number, because 20005555405 - 27 = 20005555277 is a prime.
It is a Duffinian number.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3049609 + ... + 3056161.
It is an arithmetic number, because the mean of its divisors is an integer number (836657424).
Almost surely, 220005555405 is an apocalyptic number.
It is an amenable number.
20005555405 is a deficient number, since it is larger than the sum of its proper divisors (6767482163).
20005555405 is a wasteful number, since it uses less digits than its factorization.
20005555405 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7797.
The product of its (nonzero) digits is 25000, while the sum is 31.
The spelling of 20005555405 in words is "twenty billion, five million, five hundred fifty-five thousand, four hundred five".
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