204191688120 has 64 divisors (see below), whose sum is σ = 700085790720. Its totient is φ = 46672385664.

The previous prime is 204191688091. The next prime is 204191688121. The reversal of 204191688120 is 21886191402.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204191688121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121541832 + ... + 121543511.

It is an arithmetic number, because the mean of its divisors is an integer number (10938840480).

Almost surely, 2^204191688120 is an apocalyptic number.

204191688120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204191688120 is an abundant number, since it is smaller than the sum of its proper divisors (495894102600).

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

204191688120 is a wasteful number, since it uses less digits than its factorization.

204191688120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243085364 (or 243085360 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The spelling of 204191688120 in words is "two hundred four billion, one hundred ninety-one million, six hundred eighty-eight thousand, one hundred twenty".