204064820 has 12 divisors (see below), whose sum is σ = 428536164. Its totient is φ = 81625920.

The previous prime is 204064811. The next prime is 204064823. The reversal of 204064820 is 28460402.

It can be written as a sum of positive squares in 2 ways, for example, as 102981904 + 101082916 = 10148^2 + 10054^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 204064820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204064823) 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 3 ways as a sum of consecutive naturals, for example, 5101601 + ... + 5101640.

It is an arithmetic number, because the mean of its divisors is an integer number (35711347).

Almost surely, 2^204064820 is an apocalyptic number.

204064820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204064820 is an abundant number, since it is smaller than the sum of its proper divisors (224471344).

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

204064820 is a wasteful number, since it uses less digits than its factorization.

204064820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10203250 (or 10203248 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 204064820 is about 14285.1258307374. The cubic root of 204064820 is about 588.7388747798.

The spelling of 204064820 in words is "two hundred four million, sixty-four thousand, eight hundred twenty".