205423020355 has 32 divisors (see below), whose sum is σ = 284298854400. Its totient is φ = 139574303232.

The previous prime is 205423020331. The next prime is 205423020359. The reversal of 205423020355 is 553020324502.

It is not a de Polignac number, because 205423020355 - 2⁵ = 205423020323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205423020359) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20873526 + ... + 20883364.

It is an arithmetic number, because the mean of its divisors is an integer number (8884339200).

Almost surely, 2^205423020355 is an apocalyptic number.

205423020355 is a deficient number, since it is larger than the sum of its proper divisors (78875834045).

205423020355 is a wasteful number, since it uses less digits than its factorization.

205423020355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15243.

The product of its (nonzero) digits is 36000, while the sum is 31.

Adding to 205423020355 its reverse (553020324502), we get a palindrome (758443344857).

The spelling of 205423020355 in words is "two hundred five billion, four hundred twenty-three million, twenty thousand, three hundred fifty-five".