20139390259 has 8 divisors (see below), whose sum is σ = 20641175280. Its totient is φ = 19639124736.

The previous prime is 20139390253. The next prime is 20139390263. The reversal of 20139390259 is 95209393102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20139390259 - 2²⁷ = 20005172531 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20139390253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353014 + ... + 406075.

It is an arithmetic number, because the mean of its divisors is an integer number (2580146910).

Almost surely, 2^20139390259 is an apocalyptic number.

20139390259 is a deficient number, since it is larger than the sum of its proper divisors (501785021).

20139390259 is an equidigital number, since it uses as much as digits as its factorization.

20139390259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759749.

The product of its (nonzero) digits is 131220, while the sum is 43.

The spelling of 20139390259 in words is "twenty billion, one hundred thirty-nine million, three hundred ninety thousand, two hundred fifty-nine".