205563630 has 32 divisors (see below), whose sum is σ = 495581184. Its totient is φ = 54569376.

The previous prime is 205563619. The next prime is 205563637. The reversal of 205563630 is 36365502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205563637) 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 15 ways as a sum of consecutive naturals, for example, 8674 + ... + 22053.

It is an arithmetic number, because the mean of its divisors is an integer number (15486912).

Almost surely, 2^205563630 is an apocalyptic number.

205563630 is an abundant number, since it is smaller than the sum of its proper divisors (290017554).

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

205563630 is a wasteful number, since it uses less digits than its factorization.

205563630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30960.

The product of its (nonzero) digits is 16200, while the sum is 30.

The square root of 205563630 is about 14337.4903661694. The cubic root of 205563630 is about 590.1767449027.

The spelling of 205563630 in words is "two hundred five million, five hundred sixty-three thousand, six hundred thirty".