13047320 has 64 divisors (see below), whose sum is σ = 34503840. Its totient is φ = 4377600.

The previous prime is 13047299. The next prime is 13047329. The reversal of 13047320 is 2374031.

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 = 13047292 and 13047301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13047329) 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, 4580 + ... + 6860.

Almost surely, 2^13047320 is an apocalyptic number.

13047320 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 13047320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17251920).

13047320 is an abundant number, since it is smaller than the sum of its proper divisors (21456520).

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

13047320 is a wasteful number, since it uses less digits than its factorization.

13047320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316 (or 2312 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 13047320 is about 3612.1074181148. The cubic root of 13047320 is about 235.4184185876.

Subtracting from 13047320 its reverse (2374031), we obtain a square (10673289 = 3267²).

The spelling of 13047320 in words is "thirteen million, forty-seven thousand, three hundred twenty".