205039855 has 4 divisors (see below), whose sum is σ = 246047832. Its totient is φ = 164031880.

The previous prime is 205039853. The next prime is 205039931. The reversal of 205039855 is 558930502.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 205039855 - 2¹ = 205039853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205039853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20503981 + ... + 20503990.

It is an arithmetic number, because the mean of its divisors is an integer number (61511958).

Almost surely, 2^205039855 is an apocalyptic number.

205039855 is a deficient number, since it is larger than the sum of its proper divisors (41007977).

205039855 is an equidigital number, since it uses as much as digits as its factorization.

205039855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41007976.

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 205039855 is about 14319.2127926084. The cubic root of 205039855 is about 589.6750628654.

It can be divided in two parts, 2050 and 39855, that added together give a triangular number (41905 = T₂₈₉).

The spelling of 205039855 in words is "two hundred five million, thirty-nine thousand, eight hundred fifty-five".