13111320 has 64 divisors (see below), whose sum is σ = 40410720. Its totient is φ = 3400704.

The previous prime is 13111309. The next prime is 13111327. The reversal of 13111320 is 2311131.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 13111296 and 13111305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13111327) 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, 2964 + ... + 5916.

Almost surely, 2^13111320 is an apocalyptic number.

13111320 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 13111320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20205360).

13111320 is an abundant number, since it is smaller than the sum of its proper divisors (27299400).

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

13111320 is a wasteful number, since it uses less digits than its factorization.

13111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004 (or 3000 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 13111320 is about 3620.9556749565. The cubic root of 13111320 is about 235.8027174425.

Adding to 13111320 its reverse (2311131), we get a palindrome (15422451).

It can be divided in two parts, 13111 and 320, that added together give a palindrome (13431).

The spelling of 13111320 in words is "thirteen million, one hundred eleven thousand, three hundred twenty".