20201111220 has 96 divisors (see below), whose sum is σ = 63042537600. Its totient is φ = 4803231744.

The previous prime is 20201111207. The next prime is 20201111323. The reversal of 20201111220 is 2211110202.

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 = 20201111196 and 20201111205.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 501805 + ... + 540564.

It is an arithmetic number, because the mean of its divisors is an integer number (656693100).

Almost surely, 2^20201111220 is an apocalyptic number.

20201111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20201111220 is an abundant number, since it is smaller than the sum of its proper divisors (42841426380).

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

20201111220 is a wasteful number, since it uses less digits than its factorization.

20201111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042417 (or 1042415 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20201111220 its reverse (2211110202), we get a palindrome (22412221422).

The spelling of 20201111220 in words is "twenty billion, two hundred one million, one hundred eleven thousand, two hundred twenty".