13009720 has 64 divisors (see below), whose sum is σ = 31104000. Its totient is φ = 4887168.

The previous prime is 13009691. The next prime is 13009721. The reversal of 13009720 is 2790031.

It is a junction number, because it is equal to n+sod(n) for n = 13009691 and 13009700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13009721) 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, 72591 + ... + 72769.

It is an arithmetic number, because the mean of its divisors is an integer number (486000).

Almost surely, 2^13009720 is an apocalyptic number.

13009720 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 13009720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15552000).

13009720 is an abundant number, since it is smaller than the sum of its proper divisors (18094280).

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

13009720 is a wasteful number, since it uses less digits than its factorization.

13009720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 13009720 is about 3606.8989450773. The cubic root of 13009720 is about 235.1920566679.

Adding to 13009720 its reverse (2790031), we get a palindrome (15799751).

The spelling of 13009720 in words is "thirteen million, nine thousand, seven hundred twenty".