Base | Representation |
---|---|
bin | 100110001010… |
… | …1010011101101 |
3 | 1101122121212022 |
4 | 1030111103231 |
5 | 20110311341 |
6 | 1552515525 |
7 | 332040560 |
oct | 114252355 |
9 | 41577768 |
10 | 20010221 |
11 | 10327a80 |
12 | 684bba5 |
13 | 41b7c8a |
14 | 292c4d7 |
15 | 1b53e4b |
hex | 13154ed |
20010221 has 32 divisors (see below), whose sum is σ = 26320896. Its totient is φ = 14760000.
The previous prime is 20010217. The next prime is 20010223. The reversal of 20010221 is 12201002.
It is a cyclic number.
It is not a de Polignac number, because 20010221 - 22 = 20010217 is a prime.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 20010199 and 20010208.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20010223) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198071 + ... + 198171.
It is an arithmetic number, because the mean of its divisors is an integer number (822528).
Almost surely, 220010221 is an apocalyptic number.
It is an amenable number.
20010221 is a deficient number, since it is larger than the sum of its proper divisors (6310675).
20010221 is a wasteful number, since it uses less digits than its factorization.
20010221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 233.
The product of its (nonzero) digits is 8, while the sum is 8.
The square root of 20010221 is about 4473.2785515771. The cubic root of 20010221 is about 271.4879938888.
Adding to 20010221 its reverse (12201002), we get a palindrome (32211223).
The spelling of 20010221 in words is "twenty million, ten thousand, two hundred twenty-one".
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