205091733920 has 24 divisors (see below), whose sum is σ = 484529221764. Its totient is φ = 82036693504.

The previous prime is 205091733857. The next prime is 205091733937. The reversal of 205091733920 is 29337190502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 204640426384 + 451307536 = 452372^2 + 21244^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640911509 + ... + 640911828.

Almost surely, 2^205091733920 is an apocalyptic number.

205091733920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205091733920 is an abundant number, since it is smaller than the sum of its proper divisors (279437487844).

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

205091733920 is a wasteful number, since it uses less digits than its factorization.

205091733920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281823352 (or 1281823344 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 41.

The spelling of 205091733920 in words is "two hundred five billion, ninety-one million, seven hundred thirty-three thousand, nine hundred twenty".