20112122220 has 24 divisors (see below), whose sum is σ = 56313942384. Its totient is φ = 5363232576.

The previous prime is 20112122207. The next prime is 20112122249. The reversal of 20112122220 is 2222121102.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20112122220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167600959 + ... + 167601078.

It is an arithmetic number, because the mean of its divisors is an integer number (2346414266).

Almost surely, 2^20112122220 is an apocalyptic number.

20112122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20112122220 is an abundant number, since it is smaller than the sum of its proper divisors (36201820164).

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

20112122220 is a wasteful number, since it uses less digits than its factorization.

20112122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335202049 (or 335202047 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20112122220 its reverse (2222121102), we get a palindrome (22334243322).

The spelling of 20112122220 in words is "twenty billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twenty".