205981634320 has 160 divisors (see below), whose sum is σ = 600657555456. Its totient is φ = 63817305600.

The previous prime is 205981634281. The next prime is 205981634329. The reversal of 205981634320 is 23436189502.

It is not an unprimeable number, because it can be changed into a prime (205981634329) 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, 928605 + ... + 1128835.

Almost surely, 2^205981634320 is an apocalyptic number.

205981634320 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 205981634320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300328777728).

205981634320 is an abundant number, since it is smaller than the sum of its proper divisors (394675921136).

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

205981634320 is a wasteful number, since it uses less digits than its factorization.

205981634320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200429 (or 200423 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 205981634320 in words is "two hundred five billion, nine hundred eighty-one million, six hundred thirty-four thousand, three hundred twenty".