20465456399 has 2 divisors, whose sum is σ = 20465456400. Its totient is φ = 20465456398.

The previous prime is 20465456383. The next prime is 20465456413. The reversal of 20465456399 is 99365456402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20465456399 - 2⁴ = 20465456383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20465456399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20465453399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232728199 + 10232728200.

It is an arithmetic number, because the mean of its divisors is an integer number (10232728200).

Almost surely, 2^20465456399 is an apocalyptic number.

20465456399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20465456399 is an equidigital number, since it uses as much as digits as its factorization.

20465456399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 20465456399 in words is "twenty billion, four hundred sixty-five million, four hundred fifty-six thousand, three hundred ninety-nine".