20090839 has 2 divisors, whose sum is σ = 20090840. Its totient is φ = 20090838.

The previous prime is 20090827. The next prime is 20090843. The reversal of 20090839 is 93809002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20090839 - 2⁷ = 20090711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20090839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20090849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10045419 + 10045420.

It is an arithmetic number, because the mean of its divisors is an integer number (10045420).

Almost surely, 2^20090839 is an apocalyptic number.

20090839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20090839 is an equidigital number, since it uses as much as digits as its factorization.

20090839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20090839 is about 4482.2805579303. The cubic root of 20090839 is about 271.8520993438.

The spelling of 20090839 in words is "twenty million, ninety thousand, eight hundred thirty-nine".