20023335521 has 8 divisors (see below), whose sum is σ = 23035361664. Its totient is φ = 17049196800.

The previous prime is 20023335443. The next prime is 20023335551. The reversal of 20023335521 is 12553332002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20023335521 - 2¹⁰ = 20023334497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20023335551) 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 7 ways as a sum of consecutive naturals, for example, 9470720 + ... + 9472833.

It is an arithmetic number, because the mean of its divisors is an integer number (2879420208).

Almost surely, 2^20023335521 is an apocalyptic number.

It is an amenable number.

20023335521 is a deficient number, since it is larger than the sum of its proper divisors (3012026143).

20023335521 is a wasteful number, since it uses less digits than its factorization.

20023335521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18943711.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 20023335521 its reverse (12553332002), we get a palindrome (32576667523).

The spelling of 20023335521 in words is "twenty billion, twenty-three million, three hundred thirty-five thousand, five hundred twenty-one".