204042540 has 48 divisors (see below), whose sum is σ = 615269088. Its totient is φ = 50225664.

The previous prime is 204042533. The next prime is 204042541. The reversal of 204042540 is 45240402.

It is not an unprimeable number, because it can be changed into a prime (204042541) 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, 130017 + ... + 131576.

It is an arithmetic number, because the mean of its divisors is an integer number (12818106).

Almost surely, 2^204042540 is an apocalyptic number.

204042540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204042540 is an abundant number, since it is smaller than the sum of its proper divisors (411226548).

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

204042540 is a wasteful number, since it uses less digits than its factorization.

204042540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261618 (or 261616 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 204042540 is about 14284.3459773278. The cubic root of 204042540 is about 588.7174476347.

Adding to 204042540 its reverse (45240402), we get a palindrome (249282942).

The spelling of 204042540 in words is "two hundred four million, forty-two thousand, five hundred forty".