20031120020 has 12 divisors (see below), whose sum is σ = 42065352084. Its totient is φ = 8012448000.

The previous prime is 20031120007. The next prime is 20031120029. The reversal of 20031120020 is 2002113002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3300732304 + 16730387716 = 57452^2 + 129346^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20031119983 and 20031120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031120029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500777981 + ... + 500778020.

It is an arithmetic number, because the mean of its divisors is an integer number (3505446007).

Almost surely, 2^20031120020 is an apocalyptic number.

20031120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20031120020 is an abundant number, since it is smaller than the sum of its proper divisors (22034232064).

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

20031120020 is a wasteful number, since it uses less digits than its factorization.

20031120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001556010 (or 1001556008 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20031120020 its reverse (2002113002), we get a palindrome (22033233022).

The spelling of 20031120020 in words is "twenty billion, thirty-one million, one hundred twenty thousand, twenty".