200909181820 has 24 divisors (see below), whose sum is σ = 426086605728. Its totient is φ = 79567992000.

The previous prime is 200909181817. The next prime is 200909181853. The reversal of 200909181820 is 28181909002.

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 7 ways as a sum of consecutive naturals, for example, 49727976 + ... + 49732015.

It is an arithmetic number, because the mean of its divisors is an integer number (17753608572).

Almost surely, 2^200909181820 is an apocalyptic number.

200909181820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200909181820 is an abundant number, since it is smaller than the sum of its proper divisors (225177423908).

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

200909181820 is a wasteful number, since it uses less digits than its factorization.

200909181820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99460101 (or 99460099 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The spelling of 200909181820 in words is "two hundred billion, nine hundred nine million, one hundred eighty-one thousand, eight hundred twenty".