205557594420 has 96 divisors (see below), whose sum is σ = 591347570688. Its totient is φ = 53313057792.

The previous prime is 205557594337. The next prime is 205557594461. The reversal of 205557594420 is 24495755502.

It is a self number, because there is not a number n which added to its sum of digits gives 205557594420.

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, 6148269 + ... + 6181611.

It is an arithmetic number, because the mean of its divisors is an integer number (6159870528).

Almost surely, 2^205557594420 is an apocalyptic number.

205557594420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 205557594420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295673785344).

205557594420 is an abundant number, since it is smaller than the sum of its proper divisors (385789976268).

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

205557594420 is a wasteful number, since it uses less digits than its factorization.

205557594420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36169 (or 36167 counting only the distinct ones).

The product of its (nonzero) digits is 2520000, while the sum is 48.

The spelling of 205557594420 in words is "two hundred five billion, five hundred fifty-seven million, five hundred ninety-four thousand, four hundred twenty".