205664027 has 6 divisors (see below), whose sum is σ = 213001308.
Its totient is φ = 198571352.
The previous prime is 205663987. The next prime is 205664033. The reversal of 205664027 is 720466502.
It is not a de Polignac number, because 205664027 - 218 = 205401883 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 205663984 and 205664002.
It is not an unprimeable number, because it can be changed into a prime (205664047) 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 5 ways as a sum of consecutive naturals, for example, 121433 + ... + 123114.
It is an arithmetic number, because the mean of its divisors is an integer number (35500218).
Almost surely, 2205664027 is an apocalyptic number.
205664027 is a deficient number, since it is larger than the sum of its proper divisors (7337281).
205664027 is an equidigital number, since it uses as much as digits as its factorization.
205664027 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 244605 (or 244576 counting only the distinct ones).
The product of its (nonzero) digits is 20160, while the sum is 32.
The square root of 205664027 is about 14340.9911442689.
The cubic root of 205664027 is about 590.2728097741.
The spelling of 205664027 in words is "two hundred five million, six hundred sixty-four thousand, twenty-seven".