20423099999 has 2 divisors, whose sum is σ = 20423100000. Its totient is φ = 20423099998.

The previous prime is 20423099993. The next prime is 20423100007. The reversal of 20423099999 is 99999032402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20423099999 - 2²⁰ = 20422051423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20423099993) 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 as a sum of consecutive naturals, namely, 10211549999 + 10211550000.

It is an arithmetic number, because the mean of its divisors is an integer number (10211550000).

Almost surely, 2^20423099999 is an apocalyptic number.

20423099999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423099999 is an equidigital number, since it uses as much as digits as its factorization.

20423099999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2834352, while the sum is 56.

The spelling of 20423099999 in words is "twenty billion, four hundred twenty-three million, ninety-nine thousand, nine hundred ninety-nine".