Base | Representation |
---|---|
bin | 100110001010… |
… | …0000010011100 |
3 | 1101122100201200 |
4 | 1030110002130 |
5 | 20110130040 |
6 | 1552435500 |
7 | 332016450 |
oct | 114240234 |
9 | 41570650 |
10 | 20005020 |
11 | 10324082 |
12 | 6848b90 |
13 | 41b57b9 |
14 | 292a660 |
15 | 1b52630 |
hex | 131409c |
20005020 has 72 divisors (see below), whose sum is σ = 69355104. Its totient is φ = 4572288.
The previous prime is 20005003. The next prime is 20005021. The reversal of 20005020 is 2050002.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
It is a junction number, because it is equal to n+sod(n) for n = 20004993 and 20005011.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20005021) by changing a digit.
It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6679 + ... + 9198.
Almost surely, 220005020 is an apocalyptic number.
20005020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
20005020 is an abundant number, since it is smaller than the sum of its proper divisors (49350084).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20005020 is a wasteful number, since it uses less digits than its factorization.
20005020 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 15899 (or 15894 counting only the distinct ones).
The product of its (nonzero) digits is 20, while the sum is 9.
The square root of 20005020 is about 4472.6971728477. The cubic root of 20005020 is about 271.4644703870.
Adding to 20005020 its reverse (2050002), we get a palindrome (22055022).
The spelling of 20005020 in words is "twenty million, five thousand, twenty".
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