20311131123 has 24 divisors (see below), whose sum is σ = 31073187600. Its totient is φ = 12740504064.

The previous prime is 20311131083. The next prime is 20311131131. The reversal of 20311131123 is 32113111302.

20311131123 is a `hidden beast` number, since 20 + 311 + 1 + 311 + 23 = 666.

It is not a de Polignac number, because 20311131123 - 2¹⁷ = 20311000051 is a prime.

It is a super-2 number, since 2×20311131123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20311131096 and 20311131105.

It is not an unprimeable number, because it can be changed into a prime (20311131133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 560623 + ... + 595751.

It is an arithmetic number, because the mean of its divisors is an integer number (1294716150).

Almost surely, 2^20311131123 is an apocalyptic number.

20311131123 is a deficient number, since it is larger than the sum of its proper divisors (10762056477).

20311131123 is a wasteful number, since it uses less digits than its factorization.

20311131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38931 (or 38928 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 20311131123 its reverse (32113111302), we get a palindrome (52424242425).

The spelling of 20311131123 in words is "twenty billion, three hundred eleven million, one hundred thirty-one thousand, one hundred twenty-three".