20871193 has 8 divisors (see below), whose sum is σ = 23880512. Its totient is φ = 17868816.

The previous prime is 20871187. The next prime is 20871197. The reversal of 20871193 is 39117802.

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

It is not a de Polignac number, because 20871193 - 2⁵ = 20871161 is a prime.

It is the 4569-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20871197) by changing a digit.

It is a nontrivial repunit in base 4568.

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 7 ways as a sum of consecutive naturals, for example, 10246 + ... + 12112.

It is an arithmetic number, because the mean of its divisors is an integer number (2985064).

Almost surely, 2^20871193 is an apocalyptic number.

It is an amenable number.

20871193 is a deficient number, since it is larger than the sum of its proper divisors (3009319).

20871193 is a wasteful number, since it uses less digits than its factorization.

20871193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3471.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20871193 is about 4568.5000820838. The cubic root of 20871193 is about 275.3271830293.

Adding to 20871193 its reverse (39117802), we get a palindrome (59988995).

The spelling of 20871193 in words is "twenty million, eight hundred seventy-one thousand, one hundred ninety-three".