20311311 has 8 divisors (see below), whose sum is σ = 28674864. Its totient is φ = 12744320.

The previous prime is 20311307. The next prime is 20311321. The reversal of 20311311 is 11311302.

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 20311311 - 2² = 20311307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311321) 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, 199080 + ... + 199181.

It is an arithmetic number, because the mean of its divisors is an integer number (3584358).

Almost surely, 2^20311311 is an apocalyptic number.

20311311 is a deficient number, since it is larger than the sum of its proper divisors (8363553).

20311311 is a wasteful number, since it uses less digits than its factorization.

20311311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398281.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 20311311 is about 4506.8071846930. The cubic root of 20311311 is about 272.8428969029.

Adding to 20311311 its reverse (11311302), we get a palindrome (31622613).

Subtracting from 20311311 its reverse (11311302), we obtain a palindrome (9000009).

The spelling of 20311311 in words is "twenty million, three hundred eleven thousand, three hundred eleven".