204531645 has 16 divisors (see below), whose sum is σ = 337807872. Its totient is φ = 105564480.

The previous prime is 204531643. The next prime is 204531647. The reversal of 204531645 is 546135402.

It is an interprime number because it is at equal distance from previous prime (204531643) and next prime (204531647).

It is not a de Polignac number, because 204531645 - 2¹ = 204531643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204531643) 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, 219462 + ... + 220391.

It is an arithmetic number, because the mean of its divisors is an integer number (21112992).

Almost surely, 2^204531645 is an apocalyptic number.

It is an amenable number.

204531645 is a deficient number, since it is larger than the sum of its proper divisors (133276227).

204531645 is a wasteful number, since it uses less digits than its factorization.

204531645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439892.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 204531645 is about 14301.4560447529. The cubic root of 204531645 is about 589.1874719709.

The spelling of 204531645 in words is "two hundred four million, five hundred thirty-one thousand, six hundred forty-five".