205390030 has 8 divisors (see below), whose sum is σ = 369702072. Its totient is φ = 82156008.

The previous prime is 205390027. The next prime is 205390051. The reversal of 205390030 is 30093502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 205389983 and 205390010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10269492 + ... + 10269511.

It is an arithmetic number, because the mean of its divisors is an integer number (46212759).

Almost surely, 2^205390030 is an apocalyptic number.

205390030 is a deficient number, since it is larger than the sum of its proper divisors (164312042).

205390030 is a wasteful number, since it uses less digits than its factorization.

205390030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20539010.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 205390030 is about 14331.4350293332. The cubic root of 205390030 is about 590.0105619099.

The spelling of 205390030 in words is "two hundred five million, three hundred ninety thousand, thirty".