13203520 has 112 divisors (see below), whose sum is σ = 35698176. Its totient is φ = 4646400.

The previous prime is 13203503. The next prime is 13203527. The reversal of 13203520 is 2530231.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 13203494 and 13203503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13203527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425905 + ... + 425935.

Almost surely, 2^13203520 is an apocalyptic number.

13203520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13203520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17849088).

13203520 is an abundant number, since it is smaller than the sum of its proper divisors (22494656).

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

13203520 is an equidigital number, since it uses as much as digits as its factorization.

13203520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 13203520 is about 3633.6648166830. The cubic root of 13203520 is about 236.3541556176.

Adding to 13203520 its reverse (2530231), we get a palindrome (15733751).

Subtracting from 13203520 its reverse (2530231), we obtain a square (10673289 = 3267²).

The spelling of 13203520 in words is "thirteen million, two hundred three thousand, five hundred twenty".