20389171 has 16 divisors (see below), whose sum is σ = 23794560. Its totient is φ = 17265280.

The previous prime is 20389169. The next prime is 20389207. The reversal of 20389171 is 17198302.

It is a cyclic number.

It is not a de Polignac number, because 20389171 - 2¹ = 20389169 is a prime.

20389171 is a modest number, since divided by 9171 gives 2038 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20389111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19500 + ... + 20518.

It is an arithmetic number, because the mean of its divisors is an integer number (1487160).

Almost surely, 2^20389171 is an apocalyptic number.

20389171 is a deficient number, since it is larger than the sum of its proper divisors (3405389).

20389171 is a wasteful number, since it uses less digits than its factorization.

20389171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154.

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

The square root of 20389171 is about 4515.4369666733. The cubic root of 20389171 is about 273.1910848508.

The spelling of 20389171 in words is "twenty million, three hundred eighty-nine thousand, one hundred seventy-one".