20139559 has 12 divisors (see below), whose sum is σ = 22973832. Its totient is φ = 17507600.

The previous prime is 20139557. The next prime is 20139583. The reversal of 20139559 is 95593102.

It is a happy number.

It is not a de Polignac number, because 20139559 - 2¹ = 20139557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4089 + ... + 7549.

It is an arithmetic number, because the mean of its divisors is an integer number (1914486).

Almost surely, 2^20139559 is an apocalyptic number.

20139559 is a deficient number, since it is larger than the sum of its proper divisors (2834273).

20139559 is a wasteful number, since it uses less digits than its factorization.

20139559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518 (or 3495 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 20139559 is about 4487.7120005633. The cubic root of 20139559 is about 272.0716677860.

The spelling of 20139559 in words is "twenty million, one hundred thirty-nine thousand, five hundred fifty-nine".