204404243240 has 32 divisors (see below), whose sum is σ = 459950584680. Its totient is φ = 81754401792.

The previous prime is 204404243177. The next prime is 204404243243. The reversal of 204404243240 is 42342404402.

It can be written as a sum of positive squares in 4 ways, for example, as 116388780964 + 88015462276 = 341158^2 + 296674^2 .

It is not an unprimeable number, because it can be changed into a prime (204404243243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237644 + ... + 682116.

Almost surely, 2^204404243240 is an apocalyptic number.

204404243240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204404243240 is an abundant number, since it is smaller than the sum of its proper divisors (255546341440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204404243240 is a wasteful number, since it uses less digits than its factorization.

204404243240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455981 (or 455977 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 29.

Adding to 204404243240 its reverse (42342404402), we get a palindrome (246746647642).

The spelling of 204404243240 in words is "two hundred four billion, four hundred four million, two hundred forty-three thousand, two hundred forty".