Base | Representation |
---|---|
bin | 100111101110… |
… | …1110011000001 |
3 | 1110012100100021 |
4 | 1033131303001 |
5 | 20313101200 |
6 | 2022253441 |
7 | 342031006 |
oct | 117356301 |
9 | 43170307 |
10 | 20831425 |
11 | 10838a5a |
12 | 6b87281 |
13 | 44149b4 |
14 | 2aa38ad |
15 | 1c6741a |
hex | 13ddcc1 |
20831425 has 24 divisors (see below), whose sum is σ = 27230400. Its totient is φ = 15785280.
The previous prime is 20831323. The next prime is 20831533. The reversal of 20831425 is 52413802.
It is not a de Polignac number, because 20831425 - 223 = 12442817 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (25).
It is a lonely number, since its distance to closest prime (20831323) sets a new record.
It is a self number, because there is not a number n which added to its sum of digits gives 20831425.
It is an unprimeable number.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42532 + ... + 43018.
It is an arithmetic number, because the mean of its divisors is an integer number (1134600).
Almost surely, 220831425 is an apocalyptic number.
20831425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
It is an amenable number.
20831425 is a deficient number, since it is larger than the sum of its proper divisors (6398975).
20831425 is a wasteful number, since it uses less digits than its factorization.
20831425 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 585 (or 580 counting only the distinct ones).
The product of its (nonzero) digits is 1920, while the sum is 25.
The square root of 20831425 is about 4564.1455936462. The cubic root of 20831425 is about 275.1522022476.
The spelling of 20831425 in words is "twenty million, eight hundred thirty-one thousand, four hundred twenty-five".
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