20191109200 has 60 divisors (see below), whose sum is σ = 48834848700. Its totient is φ = 8022215680.

The previous prime is 20191109179. The next prime is 20191109209. The reversal of 20191109200 is 290119102.

It can be written as a sum of positive squares in 6 ways, for example, as 9067610176 + 11123499024 = 95224^2 + 105468^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20191109209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109789 + ... + 228988.

It is an arithmetic number, because the mean of its divisors is an integer number (813914145).

Almost surely, 2^20191109200 is an apocalyptic number.

20191109200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20191109200 is an abundant number, since it is smaller than the sum of its proper divisors (28643739500).

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

20191109200 is a wasteful number, since it uses less digits than its factorization.

20191109200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338944 (or 338933 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The spelling of 20191109200 in words is "twenty billion, one hundred ninety-one million, one hundred nine thousand, two hundred".