20323021999 has 20 divisors (see below), whose sum is σ = 23725142240. Its totient is φ = 17407716480.

The previous prime is 20323021991. The next prime is 20323022039. The reversal of 20323021999 is 99912032302.

It is not a de Polignac number, because 20323021999 - 2³ = 20323021991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323021991) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6411487 + ... + 6414655.

It is an arithmetic number, because the mean of its divisors is an integer number (1186257112).

Almost surely, 2^20323021999 is an apocalyptic number.

20323021999 is a deficient number, since it is larger than the sum of its proper divisors (3402120241).

20323021999 is an frugal number, since it uses more digits than its factorization.

20323021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868 (or 5847 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 40.

The spelling of 20323021999 in words is "twenty billion, three hundred twenty-three million, twenty-one thousand, nine hundred ninety-nine".