20400323599 has 2 divisors, whose sum is σ = 20400323600. Its totient is φ = 20400323598.

The previous prime is 20400323569. The next prime is 20400323659. The reversal of 20400323599 is 99532300402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20400323599 - 2³³ = 11810389007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400323549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10200161799 + 10200161800.

It is an arithmetic number, because the mean of its divisors is an integer number (10200161800).

Almost surely, 2^20400323599 is an apocalyptic number.

20400323599 is a deficient number, since it is larger than the sum of its proper divisors (1).

20400323599 is an equidigital number, since it uses as much as digits as its factorization.

20400323599 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The spelling of 20400323599 in words is "twenty billion, four hundred million, three hundred twenty-three thousand, five hundred ninety-nine".