20389166 has 16 divisors (see below), whose sum is σ = 36792960. Its totient is φ = 8278200.

The previous prime is 20389163. The next prime is 20389169. The reversal of 20389166 is 66198302.

It is an interprime number because it is at equal distance from previous prime (20389163) and next prime (20389169).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389163) 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, 38060 + ... + 38591.

It is an arithmetic number, because the mean of its divisors is an integer number (2299560).

Almost surely, 2^20389166 is an apocalyptic number.

20389166 is a deficient number, since it is larger than the sum of its proper divisors (16403794).

20389166 is a wasteful number, since it uses less digits than its factorization.

20389166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76679.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20389166 is about 4515.4364130170. The cubic root of 20389166 is about 273.1910625194.

The spelling of 20389166 in words is "twenty million, three hundred eighty-nine thousand, one hundred sixty-six".