20120111220 has 192 divisors, whose sum is σ = 64149200640. Its totient is φ = 4668518400.

The previous prime is 20120111213. The next prime is 20120111227. The reversal of 20120111220 is 2211102102.

It is an interprime number because it is at equal distance from previous prime (20120111213) and next prime (20120111227).

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

It is a junction number, because it is equal to n+sod(n) for n = 20120111196 and 20120111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120111227) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1427166 + ... + 1441194.

It is an arithmetic number, because the mean of its divisors is an integer number (334110420).

Almost surely, 2^20120111220 is an apocalyptic number.

20120111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20120111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32074600320).

20120111220 is an abundant number, since it is smaller than the sum of its proper divisors (44029089420).

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

20120111220 is a wasteful number, since it uses less digits than its factorization.

20120111220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14146 (or 14144 counting only the distinct ones).

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

Adding to 20120111220 its reverse (2211102102), we get a palindrome (22331213322).

The spelling of 20120111220 in words is "twenty billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty".