204236009 has 12 divisors (see below), whose sum is σ = 216063744. Its totient is φ = 192960432.

The previous prime is 204236003. The next prime is 204236023. The reversal of 204236009 is 900632402.

It is not a de Polignac number, because 204236009 - 2²⁰ = 203187433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204236003) 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 11 ways as a sum of consecutive naturals, for example, 36944 + ... + 42110.

It is an arithmetic number, because the mean of its divisors is an integer number (18005312).

Almost surely, 2^204236009 is an apocalyptic number.

204236009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

204236009 is a deficient number, since it is larger than the sum of its proper divisors (11827735).

204236009 is an equidigital number, since it uses as much as digits as its factorization.

204236009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272 (or 5243 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 204236009 is about 14291.1164364440. The cubic root of 204236009 is about 588.9034588394.

The spelling of 204236009 in words is "two hundred four million, two hundred thirty-six thousand, nine".