205509104 has 20 divisors (see below), whose sum is σ = 398470776. Its totient is φ = 102677952.

The previous prime is 205509103. The next prime is 205509119. The reversal of 205509104 is 401905502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205509103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21827 + ... + 29789.

Almost surely, 2^205509104 is an apocalyptic number.

It is an amenable number.

205509104 is a deficient number, since it is larger than the sum of its proper divisors (192961672).

205509104 is a wasteful number, since it uses less digits than its factorization.

205509104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9584 (or 9578 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 205509104 is about 14335.5887217791. The cubic root of 205509104 is about 590.1245585912.

The spelling of 205509104 in words is "two hundred five million, five hundred nine thousand, one hundred four".