12505520 has 20 divisors (see below), whose sum is σ = 29075520. Its totient is φ = 5002176.

The previous prime is 12505501. The next prime is 12505543. The reversal of 12505520 is 2550521.

It is a tau number, because it is divible by the number of its divisors (20).

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 = 12505492 and 12505501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78080 + ... + 78239.

It is an arithmetic number, because the mean of its divisors is an integer number (1453776).

Almost surely, 2^12505520 is an apocalyptic number.

12505520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12505520 is an abundant number, since it is smaller than the sum of its proper divisors (16570000).

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

12505520 is a wasteful number, since it uses less digits than its factorization.

12505520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156332 (or 156326 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 12505520 is about 3536.3144656549. The cubic root of 12505520 is about 232.1135987470.

The spelling of 12505520 in words is "twelve million, five hundred five thousand, five hundred twenty".