20320311 has 8 divisors (see below), whose sum is σ = 29556864. Its totient is φ = 12315320.

The previous prime is 20320303. The next prime is 20320343. The reversal of 20320311 is 11302302.

It is a happy number.

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 20320311 - 2³ = 20320303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320361) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 307851 + ... + 307916.

It is an arithmetic number, because the mean of its divisors is an integer number (3694608).

Almost surely, 2^20320311 is an apocalyptic number.

20320311 is a deficient number, since it is larger than the sum of its proper divisors (9236553).

20320311 is a wasteful number, since it uses less digits than its factorization.

20320311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615781.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20320311 is about 4507.8055636862. The cubic root of 20320311 is about 272.8831901081.

Adding to 20320311 its reverse (11302302), we get a palindrome (31622613).

Subtracting from 20320311 its reverse (11302302), we obtain a square (9018009 = 3003²).

The spelling of 20320311 in words is "twenty million, three hundred twenty thousand, three hundred eleven".