20319899 has 2 divisors, whose sum is σ = 20319900. Its totient is φ = 20319898.

The previous prime is 20319881. The next prime is 20319907. The reversal of 20319899 is 99891302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20319899 - 2²⁰ = 19271323 is a prime.

It is not a weakly prime, because it can be changed into another prime (20319809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10159949 + 10159950.

It is an arithmetic number, because the mean of its divisors is an integer number (10159950).

Almost surely, 2^20319899 is an apocalyptic number.

20319899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20319899 is an equidigital number, since it uses as much as digits as its factorization.

20319899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 20319899 is about 4507.7598649440. The cubic root of 20319899 is about 272.8813458346.

It can be divided in two parts, 203 and 19899, that added together give a palindrome (20102).

The spelling of 20319899 in words is "twenty million, three hundred nineteen thousand, eight hundred ninety-nine".