111220000020 has 60 divisors (see below), whose sum is σ = 348901264404. Its totient is φ = 29658666240.

The previous prime is 111219999991. The next prime is 111220000037. The reversal of 111220000020 is 20000022111.

It can be written as a sum of positive squares in 2 ways, for example, as 24225677316 + 86994322704 = 155646^2 + 294948^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 111219999957 and 111220000011.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 34325541 + ... + 34328780.

Almost surely, 2^111220000020 is an apocalyptic number.

111220000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111220000020 is an abundant number, since it is smaller than the sum of its proper divisors (237681264384).

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

111220000020 is a wasteful number, since it uses less digits than its factorization.

111220000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68654342 (or 68654331 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 111220000020 its reverse (20000022111), we get a palindrome (131220022131).

The spelling of 111220000020 in words is "one hundred eleven billion, two hundred twenty million, twenty", and thus it is an aban number.