Base | Representation |
---|---|
bin | 10011001101101101… |
… | …000001001111001111 |
3 | 1222020210212101112200 |
4 | 103031231001033033 |
5 | 314223014000030 |
6 | 13251105532543 |
7 | 1330153415043 |
oct | 231555011717 |
9 | 58223771480 |
10 | 20631000015 |
11 | 882773073a |
12 | 3bb9344153 |
13 | 1c3a338722 |
14 | dda01c023 |
15 | 80b35dd60 |
hex | 4cdb413cf |
20631000015 has 96 divisors (see below), whose sum is σ = 37867969152. Its totient is φ = 10378368000.
The previous prime is 20631000007. The next prime is 20631000031. The reversal of 20631000015 is 51000013602.
20631000015 is a `hidden beast` number, since 20 + 631 + 0 + 0 + 0 + 0 + 15 = 666.
20631000015 is a nontrivial binomial coefficient, being equal to C(203131, 2).
It is not a de Polignac number, because 20631000015 - 23 = 20631000007 is a prime.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7209685 + ... + 7212545.
It is an arithmetic number, because the mean of its divisors is an integer number (394458012).
Almost surely, 220631000015 is an apocalyptic number.
20631000015 is the 203130-th triangular number.
20631000015 is a deficient number, since it is larger than the sum of its proper divisors (17236969137).
20631000015 is a wasteful number, since it uses less digits than its factorization.
20631000015 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3041 (or 3038 counting only the distinct ones).
The product of its (nonzero) digits is 180, while the sum is 18.
Adding to 20631000015 its reverse (51000013602), we get a palindrome (71631013617).
The spelling of 20631000015 in words is "twenty billion, six hundred thirty-one million, fifteen", and thus it is an aban number.
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