205740045 has 24 divisors (see below), whose sum is σ = 407561856. Its totient is φ = 94052448.

The previous prime is 205740019. The next prime is 205740047. The reversal of 205740045 is 540047502.

It is not a de Polignac number, because 205740045 - 2¹⁵ = 205707277 is a prime.

It is a super-2 number, since 2×205740045² = 84657932233204050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205740047) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 326257 + ... + 326886.

It is an arithmetic number, because the mean of its divisors is an integer number (16981744).

Almost surely, 2^205740045 is an apocalyptic number.

It is an amenable number.

205740045 is a deficient number, since it is larger than the sum of its proper divisors (201821811).

205740045 is a wasteful number, since it uses less digits than its factorization.

205740045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653161 (or 653158 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 205740045 is about 14343.6412740977. The cubic root of 205740045 is about 590.3455268032.

Adding to 205740045 its reverse (540047502), we get a palindrome (745787547).

The spelling of 205740045 in words is "two hundred five million, seven hundred forty thousand, forty-five".