20012122220 has 96 divisors (see below), whose sum is σ = 46238169600. Its totient is φ = 7241601024.

The previous prime is 20012122177. The next prime is 20012122223. The reversal of 20012122220 is 2222121002.

It is a junction number, because it is equal to n+sod(n) for n = 20012122195 and 20012122204.

It is not an unprimeable number, because it can be changed into a prime (20012122223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2253509 + ... + 2262371.

It is an arithmetic number, because the mean of its divisors is an integer number (481647600).

Almost surely, 2^20012122220 is an apocalyptic number.

20012122220 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 20012122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23119084800).

20012122220 is an abundant number, since it is smaller than the sum of its proper divisors (26226047380).

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

20012122220 is a wasteful number, since it uses less digits than its factorization.

20012122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9147 (or 9145 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20012122220 its reverse (2222121002), we get a palindrome (22234243222).

The spelling of 20012122220 in words is "twenty billion, twelve million, one hundred twenty-two thousand, two hundred twenty".