13000305520 has 40 divisors (see below), whose sum is σ = 30262589856. Its totient is φ = 5193777408.

The previous prime is 13000305509. The next prime is 13000305553. The reversal of 13000305520 is 2550300031.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×13000305520² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32887 + ... + 164566.

Almost surely, 2^13000305520 is an apocalyptic number.

13000305520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13000305520 is an abundant number, since it is smaller than the sum of its proper divisors (17262284336).

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

13000305520 is a wasteful number, since it uses less digits than its factorization.

13000305520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198289 (or 198283 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 19.

Adding to 13000305520 its reverse (2550300031), we get a palindrome (15550605551).

The spelling of 13000305520 in words is "thirteen billion, three hundred five thousand, five hundred twenty".