20388506399 has 2 divisors, whose sum is σ = 20388506400. Its totient is φ = 20388506398.

The previous prime is 20388506389. The next prime is 20388506417. The reversal of 20388506399 is 99360588302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20388506399 - 2³² = 16093539103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20388506399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20388506389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10194253199 + 10194253200.

It is an arithmetic number, because the mean of its divisors is an integer number (10194253200).

Almost surely, 2^20388506399 is an apocalyptic number.

20388506399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20388506399 is an equidigital number, since it uses as much as digits as its factorization.

20388506399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 20388506399 in words is "twenty billion, three hundred eighty-eight million, five hundred six thousand, three hundred ninety-nine".