204209680 has 20 divisors (see below), whose sum is σ = 474787692. Its totient is φ = 81683840.

The previous prime is 204209569. The next prime is 204209693. The reversal of 204209680 is 86902402.

204209680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 87310336 + 116899344 = 9344^2 + 10812^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1276231 + ... + 1276390.

Almost surely, 2^204209680 is an apocalyptic number.

204209680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204209680 is an abundant number, since it is smaller than the sum of its proper divisors (270578012).

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

204209680 is a wasteful number, since it uses less digits than its factorization.

204209680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552634 (or 2552628 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 204209680 is about 14290.1952400938. The cubic root of 204209680 is about 588.8781516706.

The spelling of 204209680 in words is "two hundred four million, two hundred nine thousand, six hundred eighty".