204665620 has 12 divisors (see below), whose sum is σ = 429797844. Its totient is φ = 81866240.

The previous prime is 204665599. The next prime is 204665621. The reversal of 204665620 is 26566402.

It can be written as a sum of positive squares in 2 ways, for example, as 108743184 + 95922436 = 10428^2 + 9794^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204665621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5116621 + ... + 5116660.

It is an arithmetic number, because the mean of its divisors is an integer number (35816487).

Almost surely, 2^204665620 is an apocalyptic number.

204665620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204665620 is an abundant number, since it is smaller than the sum of its proper divisors (225132224).

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

204665620 is a wasteful number, since it uses less digits than its factorization.

204665620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10233290 (or 10233288 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 204665620 is about 14306.1392415983. The cubic root of 204665620 is about 589.3160896599.

The spelling of 204665620 in words is "two hundred four million, six hundred sixty-five thousand, six hundred twenty".