205436638 has 16 divisors (see below), whose sum is σ = 347762160. Its totient is φ = 90160000.

The previous prime is 205436603. The next prime is 205436641. The reversal of 205436638 is 836634502.

205436638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 205436597 and 205436606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160363 + ... + 161638.

It is an arithmetic number, because the mean of its divisors is an integer number (21735135).

Almost surely, 2^205436638 is an apocalyptic number.

205436638 is a deficient number, since it is larger than the sum of its proper divisors (142325522).

205436638 is a wasteful number, since it uses less digits than its factorization.

205436638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322043.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 205436638 is about 14333.0610129170. The cubic root of 205436638 is about 590.0551877899.

The spelling of 205436638 in words is "two hundred five million, four hundred thirty-six thousand, six hundred thirty-eight".