20388171 has 8 divisors (see below), whose sum is σ = 27364864. Its totient is φ = 13501800.

The previous prime is 20388161. The next prime is 20388191. The reversal of 20388171 is 17188302.

It is a happy number.

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

It is not a de Polignac number, because 20388171 - 2⁶ = 20388107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20388161) 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 7 ways as a sum of consecutive naturals, for example, 22051 + ... + 22956.

It is an arithmetic number, because the mean of its divisors is an integer number (3420608).

Almost surely, 2^20388171 is an apocalyptic number.

20388171 is a deficient number, since it is larger than the sum of its proper divisors (6976693).

20388171 is a wasteful number, since it uses less digits than its factorization.

20388171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45161.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 20388171 is about 4515.3262340611. The cubic root of 20388171 is about 273.1866185003.

The spelling of 20388171 in words is "twenty million, three hundred eighty-eight thousand, one hundred seventy-one".