20305313 has 8 divisors (see below), whose sum is σ = 23298432. Its totient is φ = 17335296.

The previous prime is 20305277. The next prime is 20305321. The reversal of 20305313 is 31350302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20305313 - 2¹⁰ = 20304289 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20305291 and 20305300.

It is not an unprimeable number, because it can be changed into a prime (20305333) 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, 3845 + ... + 7442.

It is an arithmetic number, because the mean of its divisors is an integer number (2912304).

Almost surely, 2^20305313 is an apocalyptic number.

It is an amenable number.

20305313 is a deficient number, since it is larger than the sum of its proper divisors (2993119).

20305313 is a wasteful number, since it uses less digits than its factorization.

20305313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11551.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 20305313 is about 4506.1416977277. The cubic root of 20305313 is about 272.8160371101.

Adding to 20305313 its reverse (31350302), we get a palindrome (51655615).

The spelling of 20305313 in words is "twenty million, three hundred five thousand, three hundred thirteen".