Base | Representation |
---|---|
bin | 11000101001111… |
… | …01001011110001 |
3 | 112102011112211000 |
4 | 30110331023301 |
5 | 410421220311 |
6 | 32304512213 |
7 | 5060640666 |
oct | 1424751361 |
9 | 472145730 |
10 | 206820081 |
11 | a6820a96 |
12 | 5931b669 |
13 | 33b04660 |
14 | 1d679a6d |
15 | 13255056 |
hex | c53d2f1 |
206820081 has 16 divisors (see below), whose sum is σ = 329969920. Its totient is φ = 127273680.
The previous prime is 206820077. The next prime is 206820101. The reversal of 206820081 is 180028602.
It is not a de Polignac number, because 206820081 - 22 = 206820077 is a prime.
It is a super-2 number, since 2×2068200812 = 85549091809693122, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is a Duffinian number.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (206890081) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294265 + ... + 294966.
It is an arithmetic number, because the mean of its divisors is an integer number (20623120).
Almost surely, 2206820081 is an apocalyptic number.
It is an amenable number.
206820081 is a deficient number, since it is larger than the sum of its proper divisors (123149839).
206820081 is a wasteful number, since it uses less digits than its factorization.
206820081 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 589253 (or 589247 counting only the distinct ones).
The product of its (nonzero) digits is 1536, while the sum is 27.
The square root of 206820081 is about 14381.2405932173. The cubic root of 206820081 is about 591.3767342121.
Adding to 206820081 its reverse (180028602), we get a palindrome (386848683).
The spelling of 206820081 in words is "two hundred six million, eight hundred twenty thousand, eighty-one".
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