20311323012120 has 128 divisors (see below), whose sum is σ = 70027865971200. Its totient is φ = 4616651836416.

The previous prime is 20311323012073. The next prime is 20311323012137. The reversal of 20311323012120 is 2121032311302.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 31 ways as a sum of consecutive naturals, for example, 67391949 + ... + 67692668.

It is an arithmetic number, because the mean of its divisors is an integer number (547092702900).

Almost surely, 2^{20311323012120} is an apocalyptic number.

20311323012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20311323012120 is an abundant number, since it is smaller than the sum of its proper divisors (49716542959080).

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

20311323012120 is a wasteful number, since it uses less digits than its factorization.

20311323012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135084817 (or 135084813 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 20311323012120 its reverse (2121032311302), we get a palindrome (22432355323422).

The spelling of 20311323012120 in words is "twenty trillion, three hundred eleven billion, three hundred twenty-three million, twelve thousand, one hundred twenty".