20313131311 has 16 divisors (see below), whose sum is σ = 22501628928. Its totient is φ = 18182298400.

The previous prime is 20313131303. The next prime is 20313131317. The reversal of 20313131311 is 11313131302.

It is a cyclic number.

It is not a de Polignac number, because 20313131311 - 2³ = 20313131303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313131317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 586890 + ... + 620536.

It is an arithmetic number, because the mean of its divisors is an integer number (1406351808).

Almost surely, 2^20313131311 is an apocalyptic number.

20313131311 is a deficient number, since it is larger than the sum of its proper divisors (2188497617).

20313131311 is a wasteful number, since it uses less digits than its factorization.

20313131311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34502.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 20313131311 its reverse (11313131302), we get a palindrome (31626262613).

Subtracting from 20313131311 its reverse (11313131302), we obtain a palindrome (9000000009).

The spelling of 20313131311 in words is "twenty billion, three hundred thirteen million, one hundred thirty-one thousand, three hundred eleven".