20161389 has 8 divisors (see below), whose sum is σ = 27000160. Its totient is φ = 13381776.

The previous prime is 20161343. The next prime is 20161397. The reversal of 20161389 is 98316102.

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

It is a de Polignac number, because none of the positive numbers 2^k-20161389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20161399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13987 + ... + 15360.

It is an arithmetic number, because the mean of its divisors is an integer number (3375020).

Almost surely, 2^20161389 is an apocalyptic number.

It is an amenable number.

20161389 is a deficient number, since it is larger than the sum of its proper divisors (6838771).

20161389 is a wasteful number, since it uses less digits than its factorization.

20161389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29579.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 20161389 is about 4490.1435389083. The cubic root of 20161389 is about 272.1699350792.

The spelling of 20161389 in words is "twenty million, one hundred sixty-one thousand, three hundred eighty-nine".