12400320020 has 24 divisors (see below), whose sum is σ = 28408006368. Its totient is φ = 4509207200.

The previous prime is 12400320019. The next prime is 12400320043. The reversal of 12400320020 is 2002300421.

It is a junction number, because it is equal to n+sod(n) for n = 12400319977 and 12400320004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28182326 + ... + 28182765.

It is an arithmetic number, because the mean of its divisors is an integer number (1183666932).

Almost surely, 2^12400320020 is an apocalyptic number.

12400320020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12400320020 is an abundant number, since it is smaller than the sum of its proper divisors (16007686348).

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

12400320020 is a wasteful number, since it uses less digits than its factorization.

12400320020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56365111 (or 56365109 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

Adding to 12400320020 its reverse (2002300421), we get a palindrome (14402620441).

The spelling of 12400320020 in words is "twelve billion, four hundred million, three hundred twenty thousand, twenty".