20012111220 has 48 divisors (see below), whose sum is σ = 56052158400.
Its totient is φ = 5334825216.
The previous prime is 20012111201. The next prime is 20012111261. The reversal of 20012111220 is 2211121002.
It is a Harshad number since it is a multiple of its sum of digits (12).
It is a junction number, because it is equal to n+sod(n) for n = 20012111196 and 20012111205.
It is a congruent number.
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, 137056 + ... + 242504.
It is an arithmetic number, because the mean of its divisors is an integer number (1167753300).
Almost surely, 220012111220 is an apocalyptic number.
20012111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
20012111220 is an abundant number, since it is smaller than the sum of its proper divisors (36040047180).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20012111220 is a wasteful number, since it uses less digits than its factorization.
20012111220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 108624 (or 108622 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 12.
Adding to 20012111220 its reverse (2211121002), we get a palindrome (22223232222).
The spelling of 20012111220 in words is "twenty billion, twelve million, one hundred eleven thousand, two hundred twenty".