20013120020 has 12 divisors (see below), whose sum is σ = 42027552084. Its totient is φ = 8005248000.

The previous prime is 20013120011. The next prime is 20013120031. The reversal of 20013120020 is 2002131002.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11998573444 + 8014546576 = 109538^2 + 89524^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20013119983 and 20013120010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500327981 + ... + 500328020.

It is an arithmetic number, because the mean of its divisors is an integer number (3502296007).

Almost surely, 2^20013120020 is an apocalyptic number.

20013120020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20013120020 is an abundant number, since it is smaller than the sum of its proper divisors (22014432064).

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

20013120020 is a wasteful number, since it uses less digits than its factorization.

20013120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000656010 (or 1000656008 counting only the distinct ones).

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

Adding to 20013120020 its reverse (2002131002), we get a palindrome (22015251022).

The spelling of 20013120020 in words is "twenty billion, thirteen million, one hundred twenty thousand, twenty".