204021040 has 40 divisors (see below), whose sum is σ = 494977248. Its totient is φ = 78059520.

The previous prime is 204020987. The next prime is 204021049. The reversal of 204021040 is 40120402.

204021040 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 204021040.

It is not an unprimeable number, because it can be changed into a prime (204021049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53601 + ... + 57280.

Almost surely, 2^204021040 is an apocalyptic number.

204021040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204021040 is an abundant number, since it is smaller than the sum of its proper divisors (290956208).

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

204021040 is a wasteful number, since it uses less digits than its factorization.

204021040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110917 (or 110911 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 204021040 is about 14283.5933854195. The cubic root of 204021040 is about 588.6967691531.

Adding to 204021040 its reverse (40120402), we get a palindrome (244141442).

The spelling of 204021040 in words is "two hundred four million, twenty-one thousand, forty".