20139019 has 2 divisors, whose sum is σ = 20139020. Its totient is φ = 20139018.

The previous prime is 20139013. The next prime is 20139109. The reversal of 20139019 is 91093102.

Together with next prime (20139109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20139019 - 2³ = 20139011 is a prime.

It is a super-2 number, since 2×20139019² = 811160172564722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20138984 and 20139002.

It is not a weakly prime, because it can be changed into another prime (20139011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10069509 + 10069510.

It is an arithmetic number, because the mean of its divisors is an integer number (10069510).

Almost surely, 2^20139019 is an apocalyptic number.

20139019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20139019 is an equidigital number, since it uses as much as digits as its factorization.

20139019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 20139019 is about 4487.6518358714. The cubic root of 20139019 is about 272.0692360874.

The spelling of 20139019 in words is "twenty million, one hundred thirty-nine thousand, nineteen".