Base | Representation |
---|---|
bin | 100111101110… |
… | …1110011000110 |
3 | 1110012100100110 |
4 | 1033131303012 |
5 | 20313101210 |
6 | 2022253450 |
7 | 342031014 |
oct | 117356306 |
9 | 43170313 |
10 | 20831430 |
11 | 10838a64 |
12 | 6b87286 |
13 | 44149b9 |
14 | 2aa38b4 |
15 | 1c67420 |
hex | 13ddcc6 |
20831430 has 16 divisors (see below), whose sum is σ = 49995504. Its totient is φ = 5555040.
The previous prime is 20831323. The next prime is 20831533. The reversal of 20831430 is 3413802.
It is a happy number.
It is a junction number, because it is equal to n+sod(n) for n = 20831397 and 20831406.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 347161 + ... + 347220.
It is an arithmetic number, because the mean of its divisors is an integer number (3124719).
Almost surely, 220831430 is an apocalyptic number.
20831430 is an abundant number, since it is smaller than the sum of its proper divisors (29164074).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20831430 is a wasteful number, since it uses less digits than its factorization.
20831430 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 694391.
The product of its (nonzero) digits is 576, while the sum is 21.
The square root of 20831430 is about 4564.1461413938. The cubic root of 20831430 is about 275.1522242618.
The spelling of 20831430 in words is "twenty million, eight hundred thirty-one thousand, four hundred thirty".
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