20023304021 has 24 divisors (see below), whose sum is σ = 24336209280. Its totient is φ = 16135218432.

The previous prime is 20023303981. The next prime is 20023304047. The reversal of 20023304021 is 12040332002.

It is not a de Polignac number, because 20023304021 - 2¹⁰ = 20023302997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023304321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1983575 + ... + 1993643.

It is an arithmetic number, because the mean of its divisors is an integer number (1014008720).

Almost surely, 2^20023304021 is an apocalyptic number.

It is an amenable number.

20023304021 is a deficient number, since it is larger than the sum of its proper divisors (4312905259).

20023304021 is a wasteful number, since it uses less digits than its factorization.

20023304021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11093 (or 11076 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20023304021 its reverse (12040332002), we get a palindrome (32063636023).

The spelling of 20023304021 in words is "twenty billion, twenty-three million, three hundred four thousand, twenty-one".