13309947720 has 96 divisors (see below), whose sum is σ = 43330248000. Its totient is φ = 3543336576.

The previous prime is 13309947713. The next prime is 13309947787. The reversal of 13309947720 is 2774990331.

13309947720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184779 + ... + 246501.

It is an arithmetic number, because the mean of its divisors is an integer number (451356750).

Almost surely, 2^13309947720 is an apocalyptic number.

13309947720 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 13309947720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21665124000).

13309947720 is an abundant number, since it is smaller than the sum of its proper divisors (30020300280).

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

13309947720 is a wasteful number, since it uses less digits than its factorization.

13309947720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62339 (or 62332 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The spelling of 13309947720 in words is "thirteen billion, three hundred nine million, nine hundred forty-seven thousand, seven hundred twenty".