20011222120 has 64 divisors (see below), whose sum is σ = 45236620800. Its totient is φ = 7967013120.

The previous prime is 20011222109. The next prime is 20011222139. The reversal of 20011222120 is 2122211002.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20011222120.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9066057 + ... + 9068263.

It is an arithmetic number, because the mean of its divisors is an integer number (706822200).

Almost surely, 2^20011222120 is an apocalyptic number.

20011222120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011222120 is an abundant number, since it is smaller than the sum of its proper divisors (25225398680).

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

20011222120 is a wasteful number, since it uses less digits than its factorization.

20011222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3178 (or 3174 counting only the distinct ones).

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

Adding to 20011222120 its reverse (2122211002), we get a palindrome (22133433122).

The spelling of 20011222120 in words is "twenty billion, eleven million, two hundred twenty-two thousand, one hundred twenty".