205100018 has 16 divisors (see below), whose sum is σ = 310174656. Its totient is φ = 101712240.

The previous prime is 205100011. The next prime is 205100069. The reversal of 205100018 is 810001502.

It is a junction number, because it is equal to n+sod(n) for n = 205099969 and 205100005.

It is not an unprimeable number, because it can be changed into a prime (205100011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156755 + ... + 158057.

It is an arithmetic number, because the mean of its divisors is an integer number (19385916).

Almost surely, 2^205100018 is an apocalyptic number.

205100018 is a deficient number, since it is larger than the sum of its proper divisors (105074638).

205100018 is a wasteful number, since it uses less digits than its factorization.

205100018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 205100018 is about 14321.3134174209. The cubic root of 205100018 is about 589.7327315750.

The spelling of 205100018 in words is "two hundred five million, one hundred thousand, eighteen".