204490026909 has 24 divisors (see below), whose sum is σ = 337604508800. Its totient is φ = 116839788768.

The previous prime is 204490026907. The next prime is 204490026941. The reversal of 204490026909 is 909620094402.

It is a happy number.

It is not a de Polignac number, because 204490026909 - 2¹ = 204490026907 is a prime.

It is a super-2 number, since 2×204490026909² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204490026907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 495792 + ... + 809190.

Almost surely, 2^204490026909 is an apocalyptic number.

It is an amenable number.

204490026909 is a deficient number, since it is larger than the sum of its proper divisors (133114481891).

204490026909 is a wasteful number, since it uses less digits than its factorization.

204490026909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323769 (or 323766 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 204490026909 in words is "two hundred four billion, four hundred ninety million, twenty-six thousand, nine hundred nine".