205541505 has 48 divisors (see below), whose sum is σ = 392648256. Its totient is φ = 98824320.

The previous prime is 205541503. The next prime is 205541537. The reversal of 205541505 is 505145502.

It is not a de Polignac number, because 205541505 - 2¹ = 205541503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205541503) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 21070 + ... + 29240.

It is an arithmetic number, because the mean of its divisors is an integer number (8180172).

Almost surely, 2^205541505 is an apocalyptic number.

It is an amenable number.

205541505 is a deficient number, since it is larger than the sum of its proper divisors (187106751).

205541505 is a wasteful number, since it uses less digits than its factorization.

205541505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8238 (or 8235 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 205541505 is about 14336.7187668588. The cubic root of 205541505 is about 590.1555703902.

The spelling of 205541505 in words is "two hundred five million, five hundred forty-one thousand, five hundred five".