20131320015 has 80 divisors (see below), whose sum is σ = 38292585408. Its totient is φ = 10083308544.

The previous prime is 20131320007. The next prime is 20131320017. The reversal of 20131320015 is 51002313102.

It is not a de Polignac number, because 20131320015 - 2³ = 20131320007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20131320015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131320017) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3460249 + ... + 3466061.

Almost surely, 2^20131320015 is an apocalyptic number.

20131320015 is a deficient number, since it is larger than the sum of its proper divisors (18161265393).

20131320015 is a wasteful number, since it uses less digits than its factorization.

20131320015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6350 (or 6341 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 20131320015 its reverse (51002313102), we get a palindrome (71133633117).

The spelling of 20131320015 in words is "twenty billion, one hundred thirty-one million, three hundred twenty thousand, fifteen".