204661457 has 24 divisors (see below), whose sum is σ = 276886848. Its totient is φ = 147201120.

The previous prime is 204661441. The next prime is 204661459. The reversal of 204661457 is 754166402.

It is not a de Polignac number, because 204661457 - 2⁴ = 204661441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204661459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1718 + ... + 20304.

It is an arithmetic number, because the mean of its divisors is an integer number (11536952).

Almost surely, 2^204661457 is an apocalyptic number.

It is an amenable number.

204661457 is a deficient number, since it is larger than the sum of its proper divisors (72225391).

204661457 is a wasteful number, since it uses less digits than its factorization.

204661457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18629 (or 18618 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 204661457 is about 14305.9937438823. The cubic root of 204661457 is about 589.3120939725.

The spelling of 204661457 in words is "two hundred four million, six hundred sixty-one thousand, four hundred fifty-seven".