20311320213 has 8 divisors (see below), whose sum is σ = 30090844800. Its totient is φ = 13540880124.

The previous prime is 20311320181. The next prime is 20311320269. The reversal of 20311320213 is 31202311302.

20311320213 is a `hidden beast` number, since 20 + 311 + 320 + 2 + 13 = 666.

It is not a de Polignac number, because 20311320213 - 2⁵ = 20311320181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311320413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376135533 + ... + 376135586.

It is an arithmetic number, because the mean of its divisors is an integer number (3761355600).

Almost surely, 2^20311320213 is an apocalyptic number.

It is an amenable number.

20311320213 is a deficient number, since it is larger than the sum of its proper divisors (9779524587).

20311320213 is an equidigital number, since it uses as much as digits as its factorization.

20311320213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752271128 (or 752271122 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20311320213 its reverse (31202311302), we get a palindrome (51513631515).

The spelling of 20311320213 in words is "twenty billion, three hundred eleven million, three hundred twenty thousand, two hundred thirteen".