20021111120 has 20 divisors (see below), whose sum is σ = 46549083540. Its totient is φ = 8008444416.

The previous prime is 20021111119. The next prime is 20021111141. The reversal of 20021111120 is 2111112002.

It can be written as a sum of positive squares in 2 ways, for example, as 3627893824 + 16393217296 = 60232^2 + 128036^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125131865 + ... + 125132024.

It is an arithmetic number, because the mean of its divisors is an integer number (2327454177).

Almost surely, 2^20021111120 is an apocalyptic number.

20021111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021111120 is an abundant number, since it is smaller than the sum of its proper divisors (26527972420).

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

20021111120 is a wasteful number, since it uses less digits than its factorization.

20021111120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250263902 (or 250263896 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20021111120 its reverse (2111112002), we get a palindrome (22132223122).

The spelling of 20021111120 in words is "twenty billion, twenty-one million, one hundred eleven thousand, one hundred twenty".