20011321023 has 16 divisors (see below), whose sum is σ = 27219305472. Its totient is φ = 13073724000.

The previous prime is 20011321003. The next prime is 20011321049. The reversal of 20011321023 is 32012311002.

It is not a de Polignac number, because 20011321023 - 2⁸ = 20011320767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011320993 and 20011321011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011321003) 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, 152163 + ... + 251348.

It is an arithmetic number, because the mean of its divisors is an integer number (1701206592).

Almost surely, 2^20011321023 is an apocalyptic number.

20011321023 is a deficient number, since it is larger than the sum of its proper divisors (7207984449).

20011321023 is a wasteful number, since it uses less digits than its factorization.

20011321023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403846.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20011321023 its reverse (32012311002), we get a palindrome (52023632025).

The spelling of 20011321023 in words is "twenty billion, eleven million, three hundred twenty-one thousand, twenty-three".