20112120220 has 24 divisors (see below), whose sum is σ = 42396054624. Its totient is φ = 8014257216.

The previous prime is 20112120191. The next prime is 20112120227. The reversal of 20112120220 is 2202121102.

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 20112120220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112120227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1906539 + ... + 1917058.

It is an arithmetic number, because the mean of its divisors is an integer number (1766502276).

Almost surely, 2^20112120220 is an apocalyptic number.

20112120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20112120220 is an abundant number, since it is smaller than the sum of its proper divisors (22283934404).

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

20112120220 is a wasteful number, since it uses less digits than its factorization.

20112120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823869 (or 3823867 counting only the distinct ones).

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

Adding to 20112120220 its reverse (2202121102), we get a palindrome (22314241322).

The spelling of 20112120220 in words is "twenty billion, one hundred twelve million, one hundred twenty thousand, two hundred twenty".