13520020520 has 32 divisors (see below), whose sum is σ = 31242213000. Its totient is φ = 5261845248.

The previous prime is 13520020499. The next prime is 13520020529. The reversal of 13520020520 is 2502002531.

It can be written as a sum of positive squares in 4 ways, for example, as 10233750244 + 3286270276 = 101162^2 + 57326^2 .

It is a super-2 number, since 2×13520020520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 13520020492 and 13520020501.

It is not an unprimeable number, because it can be changed into a prime (13520020529) 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, 4566095 + ... + 4569054.

Almost surely, 2^13520020520 is an apocalyptic number.

13520020520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13520020520 is an abundant number, since it is smaller than the sum of its proper divisors (17722192480).

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

13520020520 is a wasteful number, since it uses less digits than its factorization.

13520020520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9135197 (or 9135193 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The spelling of 13520020520 in words is "thirteen billion, five hundred twenty million, twenty thousand, five hundred twenty".