205839791920 has 120 divisors (see below), whose sum is σ = 557542131984. Its totient is φ = 70468489728.

The previous prime is 205839791917. The next prime is 205839791923. The reversal of 205839791920 is 29197938502.

It is an interprime number because it is at equal distance from previous prime (205839791917) and next prime (205839791923).

It is not an unprimeable number, because it can be changed into a prime (205839791923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2615059 + ... + 2692621.

Almost surely, 2^205839791920 is an apocalyptic number.

205839791920 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 205839791920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278771065992).

205839791920 is an abundant number, since it is smaller than the sum of its proper divisors (351702340064).

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

205839791920 is a wasteful number, since it uses less digits than its factorization.

205839791920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78267 (or 78254 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 205839791920 in words is "two hundred five billion, eight hundred thirty-nine million, seven hundred ninety-one thousand, nine hundred twenty".