205247636220 has 96 divisors (see below), whose sum is σ = 627952308480. Its totient is φ = 49676520960.

The previous prime is 205247636197. The next prime is 205247636257. The reversal of 205247636220 is 22636742502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157344 + ... + 659736.

It is an arithmetic number, because the mean of its divisors is an integer number (6541169880).

Almost surely, 2^205247636220 is an apocalyptic number.

205247636220 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 205247636220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (313976154240).

205247636220 is an abundant number, since it is smaller than the sum of its proper divisors (422704672260).

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

205247636220 is a wasteful number, since it uses less digits than its factorization.

205247636220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503035 (or 503033 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 39.

The spelling of 205247636220 in words is "two hundred five billion, two hundred forty-seven million, six hundred thirty-six thousand, two hundred twenty".