20838808399 has 2 divisors, whose sum is σ = 20838808400. Its totient is φ = 20838808398.

The previous prime is 20838808373. The next prime is 20838808411. The reversal of 20838808399 is 99380883802.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20838808399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20838800399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10419404199 + 10419404200.

It is an arithmetic number, because the mean of its divisors is an integer number (10419404200).

Almost surely, 2^20838808399 is an apocalyptic number.

20838808399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20838808399 is an equidigital number, since it uses as much as digits as its factorization.

20838808399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 58.

The spelling of 20838808399 in words is "twenty billion, eight hundred thirty-eight million, eight hundred eight thousand, three hundred ninety-nine".