| Base | Representation |
|---|---|
| bin | 100110001101… |
| … | …0011000011000 |
| 3 | 1101200200100220 |
| 4 | 1030122120120 |
| 5 | 20111443000 |
| 6 | 1553200040 |
| 7 | 332155263 |
| oct | 114323030 |
| 9 | 41620326 |
| 10 | 20031000 |
| 11 | 10341650 |
| 12 | 6860020 |
| 13 | 41c4582 |
| 14 | 2935cda |
| 15 | 1b5a1a0 |
| hex | 131a618 |
20031000 has 128 divisors (see below), whose sum is σ = 68290560. Its totient is φ = 4848000.
The previous prime is 20030987. The next prime is 20031029. The reversal of 20031000 is 13002.
It is a super-2 number, since 2×200310002 = 802481922000000, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (6).
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a self number, because there is not a number n which added to its sum of digits gives 20031000.
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, 32697 + ... + 33303.
It is an arithmetic number, because the mean of its divisors is an integer number (533520).
Almost surely, 220031000 is an apocalyptic number.
20031000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20031000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34145280).
20031000 is an abundant number, since it is smaller than the sum of its proper divisors (48259560).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20031000 is a wasteful number, since it uses less digits than its factorization.
20031000 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 642 (or 628 counting only the distinct ones).
The product of its (nonzero) digits is 6, while the sum is 6.
The square root of 20031000 is about 4475.6005183662. The cubic root of 20031000 is about 271.5819341721.
Adding to 20031000 its reverse (13002), we get a palindrome (20044002).
It can be divided in two parts, 2003 and 1000, that added together give a palindrome (3003).
The spelling of 20031000 in words is "twenty million, thirty-one thousand".
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