205744990 has 32 divisors (see below), whose sum is σ = 404714880. Its totient is φ = 74685600.

The previous prime is 205744969. The next prime is 205744997. The reversal of 205744990 is 99447502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205744997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80025 + ... + 82555.

It is an arithmetic number, because the mean of its divisors is an integer number (12647340).

Almost surely, 2^205744990 is an apocalyptic number.

205744990 is a deficient number, since it is larger than the sum of its proper divisors (198969890).

205744990 is a wasteful number, since it uses less digits than its factorization.

205744990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3288.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 205744990 is about 14343.8136490963. The cubic root of 205744990 is about 590.3502564533.

The spelling of 205744990 in words is "two hundred five million, seven hundred forty-four thousand, nine hundred ninety".