20394839 has 2 divisors, whose sum is σ = 20394840. Its totient is φ = 20394838.

The previous prime is 20394827. The next prime is 20394841. The reversal of 20394839 is 93849302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20394839 - 2⁴ = 20394823 is a prime.

Together with 20394841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20394139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10197419 + 10197420.

It is an arithmetic number, because the mean of its divisors is an integer number (10197420).

Almost surely, 2^20394839 is an apocalyptic number.

20394839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20394839 is an equidigital number, since it uses as much as digits as its factorization.

20394839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 20394839 is about 4516.0645478115. The cubic root of 20394839 is about 273.2163973660.

The spelling of 20394839 in words is "twenty million, three hundred ninety-four thousand, eight hundred thirty-nine".