205011018 has 12 divisors (see below), whose sum is σ = 444190578. Its totient is φ = 68337000.

The previous prime is 205011013. The next prime is 205011019. The reversal of 205011018 is 810110502.

It can be written as a sum of positive squares in only one way, i.e., 107060409 + 97950609 = 10347^2 + 9897^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 11389501 = 205011018 / (2 + 0 + 5 + 0 + 1 + 1 + 0 + 1 + 8).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (205011013) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 5694733 + ... + 5694768.

Almost surely, 2^205011018 is an apocalyptic number.

205011018 is an abundant number, since it is smaller than the sum of its proper divisors (239179560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205011018 is a wasteful number, since it uses less digits than its factorization.

205011018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11389509 (or 11389506 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 205011018 is about 14318.2058233565. The cubic root of 205011018 is about 589.6474174157.

The spelling of 205011018 in words is "two hundred five million, eleven thousand, eighteen".