13402404020 has 12 divisors (see below), whose sum is σ = 28145048484. Its totient is φ = 5360961600.

The previous prime is 13402404013. The next prime is 13402404031. The reversal of 13402404020 is 2040420431.

It can be written as a sum of positive squares in 2 ways, for example, as 3731255056 + 9671148964 = 61084^2 + 98342^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 670120201 = 13402404020 / (1 + 3 + 4 + 0 + 2 + 4 + 0 + 4 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 13402403983 and 13402404001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335060081 + ... + 335060120.

It is an arithmetic number, because the mean of its divisors is an integer number (2345420707).

Almost surely, 2^13402404020 is an apocalyptic number.

13402404020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13402404020 is an abundant number, since it is smaller than the sum of its proper divisors (14742644464).

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

13402404020 is a wasteful number, since it uses less digits than its factorization.

13402404020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670120210 (or 670120208 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 13402404020 its reverse (2040420431), we get a palindrome (15442824451).

The spelling of 13402404020 in words is "thirteen billion, four hundred two million, four hundred four thousand, twenty".