13120400020 has 48 divisors (see below), whose sum is σ = 33911192448. Its totient is φ = 4152389760.

The previous prime is 13120399993. The next prime is 13120400077. The reversal of 13120400020 is 2000402131.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3602686 + ... + 3606325.

It is an arithmetic number, because the mean of its divisors is an integer number (706483176).

Almost surely, 2^13120400020 is an apocalyptic number.

13120400020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13120400020 is an abundant number, since it is smaller than the sum of its proper divisors (20790792428).

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

13120400020 is a wasteful number, since it uses less digits than its factorization.

13120400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7209040 (or 7209038 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 13120400020 its reverse (2000402131), we get a palindrome (15120802151).

The spelling of 13120400020 in words is "thirteen billion, one hundred twenty million, four hundred thousand, twenty".