205646630 has 24 divisors (see below), whose sum is σ = 430599888. Its totient is φ = 70507248.

The previous prime is 205646599. The next prime is 205646641. The reversal of 205646630 is 36646502.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 209354 + ... + 210333.

It is an arithmetic number, because the mean of its divisors is an integer number (17941662).

Almost surely, 2^205646630 is an apocalyptic number.

205646630 is an abundant number, since it is smaller than the sum of its proper divisors (224953258).

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

205646630 is a wasteful number, since it uses less digits than its factorization.

205646630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419708 (or 419701 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 205646630 is about 14340.3845834064. The cubic root of 205646630 is about 590.2561656940.

The spelling of 205646630 in words is "two hundred five million, six hundred forty-six thousand, six hundred thirty".