20001323023 has 4 divisors (see below), whose sum is σ = 21819625128. Its totient is φ = 18183020920.

The previous prime is 20001322981. The next prime is 20001323053. The reversal of 20001323023 is 32032310002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001323023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001322988 and 20001323006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001323053) 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 3 ways as a sum of consecutive naturals, for example, 909151036 + ... + 909151057.

It is an arithmetic number, because the mean of its divisors is an integer number (5454906282).

Almost surely, 2^20001323023 is an apocalyptic number.

20001323023 is a deficient number, since it is larger than the sum of its proper divisors (1818302105).

20001323023 is a wasteful number, since it uses less digits than its factorization.

20001323023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818302104.

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 20001323023 its reverse (32032310002), we get a palindrome (52033633025).

The spelling of 20001323023 in words is "twenty billion, one million, three hundred twenty-three thousand, twenty-three".