205643203960 has 32 divisors (see below), whose sum is σ = 463333721760. Its totient is φ = 82144123776.

The previous prime is 205643203781. The next prime is 205643203963. The reversal of 205643203960 is 69302346502.

205643203960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205643203963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3506739 + ... + 3564898.

It is an arithmetic number, because the mean of its divisors is an integer number (14479178805).

Almost surely, 2^205643203960 is an apocalyptic number.

205643203960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205643203960 is an abundant number, since it is smaller than the sum of its proper divisors (257690517800).

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

205643203960 is a wasteful number, since it uses less digits than its factorization.

205643203960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7072375 (or 7072371 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 40.

The spelling of 205643203960 in words is "two hundred five billion, six hundred forty-three million, two hundred three thousand, nine hundred sixty".