20111111200 has 72 divisors (see below), whose sum is σ = 49118645268. Its totient is φ = 8040775680.

The previous prime is 20111111191. The next prime is 20111111227. The reversal of 20111111200 is 211111102.

It can be written as a sum of positive squares in 6 ways, for example, as 16454732176 + 3656379024 = 128276^2 + 60468^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2358144 + ... + 2366656.

Almost surely, 2^20111111200 is an apocalyptic number.

20111111200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111111200 is an abundant number, since it is smaller than the sum of its proper divisors (29007534068).

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

20111111200 is a wasteful number, since it uses less digits than its factorization.

20111111200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11486 (or 11473 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20111111200 its reverse (211111102), we get a palindrome (20322222302).

The spelling of 20111111200 in words is "twenty billion, one hundred eleven million, one hundred eleven thousand, two hundred".