13187020520 has 32 divisors (see below), whose sum is σ = 30472713000. Its totient is φ = 5132245248.

The previous prime is 13187020501. The next prime is 13187020523. The reversal of 13187020520 is 2502078131.

It can be written as a sum of positive squares in 4 ways, for example, as 12728803684 + 458216836 = 112822^2 + 21406^2 .

It is not an unprimeable number, because it can be changed into a prime (13187020523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4453595 + ... + 4456554.

Almost surely, 2^13187020520 is an apocalyptic number.

13187020520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13187020520 is an abundant number, since it is smaller than the sum of its proper divisors (17285692480).

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

13187020520 is a wasteful number, since it uses less digits than its factorization.

13187020520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8910197 (or 8910193 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 13187020520 its reverse (2502078131), we get a palindrome (15689098651).

The spelling of 13187020520 in words is "thirteen billion, one hundred eighty-seven million, twenty thousand, five hundred twenty".