205505245 has 16 divisors (see below), whose sum is σ = 270970560. Its totient is φ = 148377600.

The previous prime is 205505233. The next prime is 205505249. The reversal of 205505245 is 542505502.

It is a de Polignac number, because none of the positive numbers 2^k-205505245 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205505249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5796 + ... + 21085.

It is an arithmetic number, because the mean of its divisors is an integer number (16935660).

Almost surely, 2^205505245 is an apocalyptic number.

It is an amenable number.

205505245 is a deficient number, since it is larger than the sum of its proper divisors (65465315).

205505245 is a wasteful number, since it uses less digits than its factorization.

205505245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27036.

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

The square root of 205505245 is about 14335.4541260471. The cubic root of 205505245 is about 590.1208648296.

The spelling of 205505245 in words is "two hundred five million, five hundred five thousand, two hundred forty-five".