205542055 has 4 divisors (see below), whose sum is σ = 246650472. Its totient is φ = 164433640.

The previous prime is 205542037. The next prime is 205542083. The reversal of 205542055 is 550245502.

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

It is a de Polignac number, because none of the positive numbers 2^k-205542055 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 20554201 + ... + 20554210.

It is an arithmetic number, because the mean of its divisors is an integer number (61662618).

Almost surely, 2^205542055 is an apocalyptic number.

205542055 is a deficient number, since it is larger than the sum of its proper divisors (41108417).

205542055 is an equidigital number, since it uses as much as digits as its factorization.

205542055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41108416.

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 205542055 is about 14336.7379483619. The cubic root of 205542055 is about 590.1560967806.

Adding to 205542055 its reverse (550245502), we get a palindrome (755787557).

The spelling of 205542055 in words is "two hundred five million, five hundred forty-two thousand, fifty-five".