20111111122220 has 24 divisors (see below), whose sum is σ = 43263414659808. Its totient is φ = 7848238486400.

The previous prime is 20111111122163. The next prime is 20111111122237. The reversal of 20111111122220 is 2222111111102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12262871816 + ... + 12262873455.

It is an arithmetic number, because the mean of its divisors is an integer number (1802642277492).

Almost surely, 2^{20111111122220} is an apocalyptic number.

20111111122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111111122220 is an abundant number, since it is smaller than the sum of its proper divisors (23152303537588).

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

20111111122220 is a wasteful number, since it uses less digits than its factorization.

20111111122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24525745321 (or 24525745319 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20111111122220 its reverse (2222111111102), we get a palindrome (22333222233322).

The spelling of 20111111122220 in words is "twenty trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty-two thousand, two hundred twenty".