15801404020 has 12 divisors (see below), whose sum is σ = 33182948484. Its totient is φ = 6320561600.

The previous prime is 15801403993. The next prime is 15801404053. The reversal of 15801404020 is 2040410851.

It can be written as a sum of positive squares in 2 ways, for example, as 2793545316 + 13007858704 = 52854^2 + 114052^2 .

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 3 ways as a sum of consecutive naturals, for example, 395035081 + ... + 395035120.

It is an arithmetic number, because the mean of its divisors is an integer number (2765245707).

Almost surely, 2^15801404020 is an apocalyptic number.

15801404020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15801404020 is an abundant number, since it is smaller than the sum of its proper divisors (17381544464).

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

15801404020 is a wasteful number, since it uses less digits than its factorization.

15801404020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790070210 (or 790070208 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 15801404020 its reverse (2040410851), we get a palindrome (17841814871).

The spelling of 15801404020 in words is "fifteen billion, eight hundred one million, four hundred four thousand, twenty".