111111110020 has 12 divisors (see below), whose sum is σ = 233333331084. Its totient is φ = 44444444000.

The previous prime is 111111110009. The next prime is 111111110053. The reversal of 111111110020 is 20011111111.

It can be written as a sum of positive squares in 2 ways, for example, as 23982239044 + 87128870976 = 154862^2 + 295176^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 111111109979 and 111111110006.

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 3 ways as a sum of consecutive naturals, for example, 2777777731 + ... + 2777777770.

It is an arithmetic number, because the mean of its divisors is an integer number (19444444257).

Almost surely, 2^111111110020 is an apocalyptic number.

111111110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111110020 is an abundant number, since it is smaller than the sum of its proper divisors (122222221064).

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

111111110020 is a wasteful number, since it uses less digits than its factorization.

111111110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555555510 (or 5555555508 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 111111110020 its reverse (20011111111), we get a palindrome (131122221131).

The spelling of 111111110020 in words is "one hundred eleven billion, one hundred eleven million, one hundred ten thousand, twenty".