20319823 has 2 divisors, whose sum is σ = 20319824. Its totient is φ = 20319822.

The previous prime is 20319821. The next prime is 20319853. The reversal of 20319823 is 32891302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20319823 - 2¹ = 20319821 is a prime.

Together with 20319821, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20319791 and 20319800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20319821) 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, 10159911 + 10159912.

It is an arithmetic number, because the mean of its divisors is an integer number (10159912).

Almost surely, 2^20319823 is an apocalyptic number.

20319823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20319823 is an equidigital number, since it uses as much as digits as its factorization.

20319823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 20319823 is about 4507.7514350283. The cubic root of 20319823 is about 272.8810056261.

The spelling of 20319823 in words is "twenty million, three hundred nineteen thousand, eight hundred twenty-three".