20139903 has 12 divisors (see below), whose sum is σ = 33246928. Its totient is φ = 11508480.

The previous prime is 20139893. The next prime is 20139913. The reversal of 20139903 is 30993102.

It is an interprime number because it is at equal distance from previous prime (20139893) and next prime (20139913).

It is not a de Polignac number, because 20139903 - 2⁴ = 20139887 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 (20139913) 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 11 ways as a sum of consecutive naturals, for example, 159778 + ... + 159903.

Almost surely, 2^20139903 is an apocalyptic number.

20139903 is a deficient number, since it is larger than the sum of its proper divisors (13107025).

20139903 is a wasteful number, since it uses less digits than its factorization.

20139903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319694 (or 319691 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 20139903 is about 4487.7503272798. The cubic root of 20139903 is about 272.0732168454.

It can be divided in two parts, 201 and 39903, that added together give a palindrome (40104).

The spelling of 20139903 in words is "twenty million, one hundred thirty-nine thousand, nine hundred three".