20311105623 has 16 divisors (see below), whose sum is σ = 28820072160. Its totient is φ = 12679525376.

The previous prime is 20311105603. The next prime is 20311105651. The reversal of 20311105623 is 32650111302.

It is a cyclic number.

It is not a de Polignac number, because 20311105623 - 2¹⁰ = 20311104599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20311105593 and 20311105602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311105603) 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 15 ways as a sum of consecutive naturals, for example, 1000758 + ... + 1020851.

It is an arithmetic number, because the mean of its divisors is an integer number (1801254510).

Almost surely, 2^20311105623 is an apocalyptic number.

20311105623 is a deficient number, since it is larger than the sum of its proper divisors (8508966537).

20311105623 is a wasteful number, since it uses less digits than its factorization.

20311105623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021826.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 20311105623 its reverse (32650111302), we get a palindrome (52961216925).

The spelling of 20311105623 in words is "twenty billion, three hundred eleven million, one hundred five thousand, six hundred twenty-three".