Base | Representation |
---|---|
bin | 10010101000110000… |
… | …110000000011010000 |
3 | 1220122121122100211202 |
4 | 102220300300003100 |
5 | 311440333034300 |
6 | 13105405530332 |
7 | 1305616400525 |
oct | 225060600320 |
9 | 56577570752 |
10 | 20011221200 |
11 | 85398a3743 |
12 | 3a658739a8 |
13 | 1b6bb062b9 |
14 | d7b9a714c |
15 | 7c1c35ad5 |
hex | 4a8c300d0 |
20011221200 has 60 divisors (see below), whose sum is σ = 48109485900. Its totient is φ = 7999073280.
The previous prime is 20011221193. The next prime is 20011221239. The reversal of 20011221200 is 212211002.
It is a happy number.
It can be written as a sum of positive squares in 6 ways, for example, as 125708944 + 19885512256 = 11212^2 + 141016^2 .
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, 603452 + ... + 635748.
It is an arithmetic number, because the mean of its divisors is an integer number (801824765).
Almost surely, 220011221200 is an apocalyptic number.
20011221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
20011221200 is an abundant number, since it is smaller than the sum of its proper divisors (28098264700).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20011221200 is a wasteful number, since it uses less digits than its factorization.
20011221200 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 33864 (or 33853 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 11.
Adding to 20011221200 its reverse (212211002), we get a palindrome (20223432202).
The spelling of 20011221200 in words is "twenty billion, eleven million, two hundred twenty-one thousand, two hundred".
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