205507930840 has 32 divisors (see below), whose sum is σ = 462411990000. Its totient is φ = 82199768704.

The previous prime is 205507930799. The next prime is 205507930843. The reversal of 205507930840 is 48039705502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205507930843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018686 + ... + 1203634.

Almost surely, 2^205507930840 is an apocalyptic number.

205507930840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205507930840 is an abundant number, since it is smaller than the sum of its proper divisors (256904059160).

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

205507930840 is a wasteful number, since it uses less digits than its factorization.

205507930840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212739 (or 212735 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 205507930840 in words is "two hundred five billion, five hundred seven million, nine hundred thirty thousand, eight hundred forty".