20139603 has 24 divisors (see below), whose sum is σ = 29845200. Its totient is φ = 12070080.

The previous prime is 20139599. The next prime is 20139619. The reversal of 20139603 is 30693102.

It is not a de Polignac number, because 20139603 - 2² = 20139599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20139643) 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 23 ways as a sum of consecutive naturals, for example, 39313 + ... + 39821.

It is an arithmetic number, because the mean of its divisors is an integer number (1243550).

Almost surely, 2^20139603 is an apocalyptic number.

20139603 is a deficient number, since it is larger than the sum of its proper divisors (9705597).

20139603 is a wasteful number, since it uses less digits than its factorization.

20139603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 20139603 is about 4487.7169028360. The cubic root of 20139603 is about 272.0718659225.

The spelling of 20139603 in words is "twenty million, one hundred thirty-nine thousand, six hundred three".