20320313 has 4 divisors (see below), whose sum is σ = 21883428. Its totient is φ = 18757200.

The previous prime is 20320303. The next prime is 20320343. The reversal of 20320313 is 31302302.

20320313 = 3187² + 3188².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10163344 + 10156969 = 3188^2 + 3187^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320313 - 2⁸ = 20320057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20320303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781538 + ... + 781563.

It is an arithmetic number, because the mean of its divisors is an integer number (5470857).

Almost surely, 2^20320313 is an apocalyptic number.

20320313 is the 3188-th centered square number.

It is an amenable number.

20320313 is a deficient number, since it is larger than the sum of its proper divisors (1563115).

20320313 is a wasteful number, since it uses less digits than its factorization.

20320313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563114.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 20320313 is about 4507.8057855236. The cubic root of 20320313 is about 272.8831990609.

Adding to 20320313 its reverse (31302302), we get a palindrome (51622615).

The spelling of 20320313 in words is "twenty million, three hundred twenty thousand, three hundred thirteen".