20111112220 has 12 divisors (see below), whose sum is σ = 42233335704. Its totient is φ = 8044444880.

The previous prime is 20111112199. The next prime is 20111112221. The reversal of 20111112220 is 2221111102.

It is a self number, because there is not a number n which added to its sum of digits gives 20111112220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111112221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502777786 + ... + 502777825.

It is an arithmetic number, because the mean of its divisors is an integer number (3519444642).

Almost surely, 2^20111112220 is an apocalyptic number.

20111112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111112220 is an abundant number, since it is smaller than the sum of its proper divisors (22122223484).

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

20111112220 is a wasteful number, since it uses less digits than its factorization.

20111112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005555620 (or 1005555618 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20111112220 its reverse (2221111102), we get a palindrome (22332223322).

The spelling of 20111112220 in words is "twenty billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty".