Base | Representation |
---|---|
bin | 100110100011… |
… | …0100100110100 |
3 | 1102000212200100 |
4 | 1031012210310 |
5 | 20133241040 |
6 | 2001114100 |
7 | 333541113 |
oct | 115064464 |
9 | 42025610 |
10 | 20212020 |
11 | 10455654 |
12 | 6928930 |
13 | 4258a9a |
14 | 2981c7a |
15 | 1b93b30 |
hex | 1346934 |
20212020 has 36 divisors (see below), whose sum is σ = 61310340. Its totient is φ = 5389824.
The previous prime is 20212013. The next prime is 20212033. The reversal of 20212020 is 2021202.
It can be written as a sum of positive squares in 2 ways, for example, as 15776784 + 4435236 = 3972^2 + 2106^2 .
It is a tau number, because it is divible by the number of its divisors (36).
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a junction number, because it is equal to n+sod(n) for n = 20211993 and 20212011.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55965 + ... + 56324.
It is an arithmetic number, because the mean of its divisors is an integer number (1703065).
Almost surely, 220212020 is an apocalyptic number.
20212020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
20212020 is an abundant number, since it is smaller than the sum of its proper divisors (41098320).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20212020 is a wasteful number, since it uses less digits than its factorization.
20212020 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 112304 (or 112299 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 9.
The square root of 20212020 is about 4495.7780194311. The cubic root of 20212020 is about 272.3975767475.
Adding to 20212020 its reverse (2021202), we get a palindrome (22233222).
The spelling of 20212020 in words is "twenty million, two hundred twelve thousand, twenty".
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