205545505 has 16 divisors (see below), whose sum is σ = 275643648. Its totient is φ = 145840000.

The previous prime is 205545493. The next prime is 205545511. The reversal of 205545505 is 505545502.

It is not a de Polignac number, because 205545505 - 2¹³ = 205537313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43321 + ... + 47830.

It is an arithmetic number, because the mean of its divisors is an integer number (17227728).

Almost surely, 2^205545505 is an apocalyptic number.

It is an amenable number.

205545505 is a deficient number, since it is larger than the sum of its proper divisors (70098143).

205545505 is a wasteful number, since it uses less digits than its factorization.

205545505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91208.

The product of its (nonzero) digits is 25000, while the sum is 31.

The square root of 205545505 is about 14336.8582681144. The cubic root of 205545505 is about 590.1593986631.

The spelling of 205545505 in words is "two hundred five million, five hundred forty-five thousand, five hundred five".