20396939 has 2 divisors, whose sum is σ = 20396940. Its totient is φ = 20396938.

The previous prime is 20396933. The next prime is 20396941. The reversal of 20396939 is 93969302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20396939 - 2⁸ = 20396683 is a prime.

Together with 20396941, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20396896 and 20396905.

It is not a weakly prime, because it can be changed into another prime (20396933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10198469 + 10198470.

It is an arithmetic number, because the mean of its divisors is an integer number (10198470).

Almost surely, 2^20396939 is an apocalyptic number.

20396939 is a deficient number, since it is larger than the sum of its proper divisors (1).

20396939 is an equidigital number, since it uses as much as digits as its factorization.

20396939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 20396939 is about 4516.2970451466. The cubic root of 20396939 is about 273.2257744891.

The spelling of 20396939 in words is "twenty million, three hundred ninety-six thousand, nine hundred thirty-nine".