205890436 has 12 divisors (see below), whose sum is σ = 360418828. Its totient is φ = 102913632.

The previous prime is 205890431. The next prime is 205890439. The reversal of 205890436 is 634098502.

205890436 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 29160000 + 176730436 = 5400^2 + 13294^2 .

205890436 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 205890395 and 205890404.

It is not an unprimeable number, because it can be changed into a prime (205890431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12790 + ... + 23986.

Almost surely, 2^205890436 is an apocalyptic number.

It is an amenable number.

205890436 is a deficient number, since it is larger than the sum of its proper divisors (154528392).

205890436 is a wasteful number, since it uses less digits than its factorization.

205890436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15798 (or 15796 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 205890436 is about 14348.8827439630. The cubic root of 205890436 is about 590.4893345393.

The spelling of 205890436 in words is "two hundred five million, eight hundred ninety thousand, four hundred thirty-six".