20139163 has 4 divisors (see below), whose sum is σ = 21970008. Its totient is φ = 18308320.

The previous prime is 20139157. The next prime is 20139227. The reversal of 20139163 is 36193102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20139163 - 2⁵ = 20139131 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (20139143) 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 3 ways as a sum of consecutive naturals, for example, 915406 + ... + 915427.

It is an arithmetic number, because the mean of its divisors is an integer number (5492502).

Almost surely, 2^20139163 is an apocalyptic number.

20139163 is a deficient number, since it is larger than the sum of its proper divisors (1830845).

20139163 is a wasteful number, since it uses less digits than its factorization.

20139163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830844.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 20139163 is about 4487.6678798681. The cubic root of 20139163 is about 272.0698845446.

It can be divided in two parts, 20139 and 163, that added together give a palindrome (20302).

The spelling of 20139163 in words is "twenty million, one hundred thirty-nine thousand, one hundred sixty-three".