205323134520 has 128 divisors (see below), whose sum is σ = 726673674240. Its totient is φ = 45417093120.

The previous prime is 205323134519. The next prime is 205323134543. The reversal of 205323134520 is 25431323502.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3916417 + ... + 3968496.

It is an arithmetic number, because the mean of its divisors is an integer number (5677138080).

Almost surely, 2^205323134520 is an apocalyptic number.

205323134520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205323134520 is an abundant number, since it is smaller than the sum of its proper divisors (521350539720).

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

205323134520 is a wasteful number, since it uses less digits than its factorization.

205323134520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7884965 (or 7884961 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The spelling of 205323134520 in words is "two hundred five billion, three hundred twenty-three million, one hundred thirty-four thousand, five hundred twenty".