13081720 has 32 divisors (see below), whose sum is σ = 30232800. Its totient is φ = 5090688.

The previous prime is 13081699. The next prime is 13081727. The reversal of 13081720 is 2718031.

It is a super-2 number, since 2×13081720² = 342262796316800, which contains 22 as substring.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 13081691 and 13081700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13081727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2940 + ... + 5899.

It is an arithmetic number, because the mean of its divisors is an integer number (944775).

Almost surely, 2^13081720 is an apocalyptic number.

13081720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13081720 is an abundant number, since it is smaller than the sum of its proper divisors (17151080).

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

13081720 is a wasteful number, since it uses less digits than its factorization.

13081720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8887 (or 8883 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 13081720 is about 3616.8660467316. The cubic root of 13081720 is about 235.6251350298.

Adding to 13081720 its reverse (2718031), we get a palindrome (15799751).

The spelling of 13081720 in words is "thirteen million, eighty-one thousand, seven hundred twenty".