19923604801 has 45 divisors (see below), whose sum is σ = 23353868531. Its totient is φ = 16992321984.

The previous prime is 19923604787. The next prime is 19923604823. The reversal of 19923604801 is 10840632991.

It is a happy number.

The square root of 19923604801 is 141151.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15511457025 + 4412147776 = 124545^2 + 66424^2 .

It is not a de Polignac number, because 19923604801 - 2⁵ = 19923604769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19923604301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 866243676 + ... + 866243698.

Almost surely, 2^19923604801 is an apocalyptic number.

19923604801 is the 141151-st square number.

19923604801 is the 70576-th centered octagonal number.

It is an amenable number.

19923604801 is a deficient number, since it is larger than the sum of its proper divisors (3430263730).

19923604801 is an frugal number, since it uses more digits than its factorization.

19923604801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 19923604801 in words is "nineteen billion, nine hundred twenty-three million, six hundred four thousand, eight hundred one".