205120055320 has 32 divisors (see below), whose sum is σ = 462994657920. Its totient is φ = 81785882880.

The previous prime is 205120055311. The next prime is 205120055333. The reversal of 205120055320 is 23550021502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8179176 + ... + 8204215.

It is an arithmetic number, because the mean of its divisors is an integer number (14468583060).

Almost surely, 2^205120055320 is an apocalyptic number.

205120055320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205120055320 is an abundant number, since it is smaller than the sum of its proper divisors (257874602600).

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

205120055320 is a wasteful number, since it uses less digits than its factorization.

205120055320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16383715 (or 16383711 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 205120055320 its reverse (23550021502), we get a palindrome (228670076822).

The spelling of 205120055320 in words is "two hundred five billion, one hundred twenty million, fifty-five thousand, three hundred twenty".