20112201220 has 48 divisors (see below), whose sum is σ = 46262165040. Its totient is φ = 7310557184.

The previous prime is 20112201217. The next prime is 20112201229. The reversal of 20112201220 is 2210221102.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 172501956 + 19939699264 = 13134^2 + 141208^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20112201220.

It is not an unprimeable number, because it can be changed into a prime (20112201229) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1010029 + ... + 1029748.

It is an arithmetic number, because the mean of its divisors is an integer number (963795105).

Almost surely, 2^20112201220 is an apocalyptic number.

20112201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20112201220 is an abundant number, since it is smaller than the sum of its proper divisors (26149963820).

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

20112201220 is a wasteful number, since it uses less digits than its factorization.

20112201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039832 (or 2039830 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20112201220 its reverse (2210221102), we get a palindrome (22322422322).

The spelling of 20112201220 in words is "twenty billion, one hundred twelve million, two hundred one thousand, two hundred twenty".