20015839 has 2 divisors, whose sum is σ = 20015840. Its totient is φ = 20015838.

The previous prime is 20015777. The next prime is 20015893. The reversal of 20015839 is 93851002.

Together with next prime (20015893) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20015839 - 2⁷ = 20015711 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20015899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10007919 + 10007920.

It is an arithmetic number, because the mean of its divisors is an integer number (10007920).

Almost surely, 2^20015839 is an apocalyptic number.

20015839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20015839 is an equidigital number, since it uses as much as digits as its factorization.

20015839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 20015839 is about 4473.9064585662. The cubic root of 20015839 is about 271.5133988528.

The spelling of 20015839 in words is "twenty million, fifteen thousand, eight hundred thirty-nine".