20011220112 has 80 divisors (see below), whose sum is σ = 55813163840. Its totient is φ = 6141712896.

The previous prime is 20011220093. The next prime is 20011220113. The reversal of 20011220112 is 21102211002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (20011220113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207339 + ... + 288117.

It is an arithmetic number, because the mean of its divisors is an integer number (697664548).

Almost surely, 2^20011220112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20011220112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27906581920).

20011220112 is an abundant number, since it is smaller than the sum of its proper divisors (35801943728).

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

20011220112 is a wasteful number, since it uses less digits than its factorization.

20011220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81200 (or 81194 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20011220112 its reverse (21102211002), we get a palindrome (41113431114).

The spelling of 20011220112 in words is "twenty billion, eleven million, two hundred twenty thousand, one hundred twelve".