205431405304220 has 48 divisors (see below), whose sum is σ = 436657590059040. Its totient is φ = 81172494740736.

The previous prime is 205431405304207. The next prime is 205431405304261. The reversal of 205431405304220 is 22403504134502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5788646 + ... + 21080114.

It is an arithmetic number, because the mean of its divisors is an integer number (9097033126230).

Almost surely, 2^{205431405304220} is an apocalyptic number.

205431405304220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205431405304220 is an abundant number, since it is smaller than the sum of its proper divisors (231226184754820).

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

205431405304220 is a wasteful number, since it uses less digits than its factorization.

205431405304220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15299654 (or 15299652 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 205431405304220 its reverse (22403504134502), we get a palindrome (227834909438722).

The spelling of 205431405304220 in words is "two hundred five trillion, four hundred thirty-one billion, four hundred five million, three hundred four thousand, two hundred twenty".