204513173720 has 16 divisors (see below), whose sum is σ = 460154640960. Its totient is φ = 81805269472.

The previous prime is 204513173699. The next prime is 204513173723. The reversal of 204513173720 is 27371315402.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204513173723) 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 3 ways as a sum of consecutive naturals, for example, 2556414632 + ... + 2556414711.

It is an arithmetic number, because the mean of its divisors is an integer number (28759665060).

Almost surely, 2^204513173720 is an apocalyptic number.

204513173720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204513173720 is an abundant number, since it is smaller than the sum of its proper divisors (255641467240).

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

204513173720 is a wasteful number, since it uses less digits than its factorization.

204513173720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5112829354 (or 5112829350 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The spelling of 204513173720 in words is "two hundred four billion, five hundred thirteen million, one hundred seventy-three thousand, seven hundred twenty".