20310120644440 has 128 divisors (see below), whose sum is σ = 51973948857600. Its totient is φ = 7077633937920.

The previous prime is 20310120644329. The next prime is 20310120644447. The reversal of 20310120644440 is 4444602101302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310120644447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9124350 + ... + 11129869.

It is an arithmetic number, because the mean of its divisors is an integer number (406046475450).

Almost surely, 2^{20310120644440} is an apocalyptic number.

20310120644440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20310120644440 is an abundant number, since it is smaller than the sum of its proper divisors (31663828213160).

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

20310120644440 is a wasteful number, since it uses less digits than its factorization.

20310120644440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20254337 (or 20254333 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 20310120644440 its reverse (4444602101302), we get a palindrome (24754722745742).

The spelling of 20310120644440 in words is "twenty trillion, three hundred ten billion, one hundred twenty million, six hundred forty-four thousand, four hundred forty".