Base | Representation |
---|---|
bin | 100110111110… |
… | …1110001110011 |
3 | 1102110100211211 |
4 | 1031331301303 |
5 | 20213010011 |
6 | 2010020551 |
7 | 335502250 |
oct | 115756163 |
9 | 42410754 |
10 | 20438131 |
11 | 1059a51a |
12 | 6a17757 |
13 | 430798c |
14 | 2a00427 |
15 | 1bdab21 |
hex | 137dc73 |
20438131 has 32 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 15590400.
The previous prime is 20438123. The next prime is 20438147. The reversal of 20438131 is 13183402.
20438131 = 3542 + 3552 + ... + 4722.
It is not a de Polignac number, because 20438131 - 23 = 20438123 is a prime.
It is a super-2 number, since 2×204381312 = 835434397546322, which contains 22 as substring.
It is not an unprimeable number, because it can be changed into a prime (20438161) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 287826 + ... + 287896.
It is an arithmetic number, because the mean of its divisors is an integer number (816480).
Almost surely, 220438131 is an apocalyptic number.
20438131 is a deficient number, since it is larger than the sum of its proper divisors (5689229).
20438131 is a wasteful number, since it uses less digits than its factorization.
20438131 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 195.
The product of its (nonzero) digits is 576, while the sum is 22.
The square root of 20438131 is about 4520.8551182271. The cubic root of 20438131 is about 273.4095790005.
The spelling of 20438131 in words is "twenty million, four hundred thirty-eight thousand, one hundred thirty-one".
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