20320013 has 8 divisors (see below), whose sum is σ = 23616960. Its totient is φ = 17121600.

The previous prime is 20320007. The next prime is 20320021. The reversal of 20320013 is 31002302.

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 20320013 - 2⁸ = 20319757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20319976 and 20320003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24188 + ... + 25013.

It is an arithmetic number, because the mean of its divisors is an integer number (2952120).

Almost surely, 2^20320013 is an apocalyptic number.

It is an amenable number.

20320013 is a deficient number, since it is larger than the sum of its proper divisors (3296947).

20320013 is an equidigital number, since it uses as much as digits as its factorization.

20320013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49267.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 20320013 is about 4507.7725097880. The cubic root of 20320013 is about 272.8818561458.

Adding to 20320013 its reverse (31002302), we get a palindrome (51322315).

The spelling of 20320013 in words is "twenty million, three hundred twenty thousand, thirteen".