205505745 has 32 divisors (see below), whose sum is σ = 341798400. Its totient is φ = 105310464.

The previous prime is 205505723. The next prime is 205505747. The reversal of 205505745 is 547505502.

It is not a de Polignac number, because 205505745 - 2⁹ = 205505233 is a prime.

It is a super-2 number, since 2×205505745² = 84465222456010050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205505747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98584 + ... + 100646.

It is an arithmetic number, because the mean of its divisors is an integer number (10681200).

Almost surely, 2^205505745 is an apocalyptic number.

It is an amenable number.

205505745 is a deficient number, since it is larger than the sum of its proper divisors (136292655).

205505745 is a wasteful number, since it uses less digits than its factorization.

205505745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2329.

The product of its (nonzero) digits is 35000, while the sum is 33.

The square root of 205505745 is about 14335.4715653166. The cubic root of 205505745 is about 590.1213434227.

The spelling of 205505745 in words is "two hundred five million, five hundred five thousand, seven hundred forty-five".