206604009 has 24 divisors (see below), whose sum is σ = 329726592. Its totient is φ = 123995520.

The previous prime is 206604007. The next prime is 206604019. The reversal of 206604009 is 900406602.

It is not a de Polignac number, because 206604009 - 2¹ = 206604007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206604001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25837 + ... + 32874.

It is an arithmetic number, because the mean of its divisors is an integer number (13738608).

Almost surely, 2^206604009 is an apocalyptic number.

It is an amenable number.

206604009 is a deficient number, since it is larger than the sum of its proper divisors (123122583).

206604009 is a wasteful number, since it uses less digits than its factorization.

206604009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58757 (or 58754 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 206604009 is about 14373.7263435756. The cubic root of 206604009 is about 591.1707186298.

The spelling of 206604009 in words is "two hundred six million, six hundred four thousand, nine".