13420305 has 24 divisors (see below), whose sum is σ = 23648040. Its totient is φ = 7038720.

The previous prime is 13420291. The next prime is 13420321. The reversal of 13420305 is 50302431.

13420305 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 199809 + 13220496 = 447^2 + 3636^2 .

It is not a de Polignac number, because 13420305 - 2⁷ = 13420177 is a prime.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 301 + ... + 5189.

It is an arithmetic number, because the mean of its divisors is an integer number (985335).

Almost surely, 2^13420305 is an apocalyptic number.

13420305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13420305 is a deficient number, since it is larger than the sum of its proper divisors (10227735).

13420305 is a wasteful number, since it uses less digits than its factorization.

13420305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4961 (or 4958 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 13420305 is about 3663.3734453370. The cubic root of 13420305 is about 237.6406848842.

Adding to 13420305 its reverse (50302431), we get a palindrome (63722736).

The spelling of 13420305 in words is "thirteen million, four hundred twenty thousand, three hundred five".