20111212220 has 48 divisors (see below), whose sum is σ = 46404489600. Its totient is φ = 7260544320.

The previous prime is 20111212217. The next prime is 20111212229. The reversal of 20111212220 is 2221211102.

It is a junction number, because it is equal to n+sod(n) for n = 20111212195 and 20111212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111212229) 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, 298250 + ... + 359409.

It is an arithmetic number, because the mean of its divisors is an integer number (966760200).

Almost surely, 2^20111212220 is an apocalyptic number.

20111212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111212220 is an abundant number, since it is smaller than the sum of its proper divisors (26293277380).

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

20111212220 is a wasteful number, since it uses less digits than its factorization.

20111212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657818 (or 657816 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20111212220 its reverse (2221211102), we get a palindrome (22332423322).

The spelling of 20111212220 in words is "twenty billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty".