20387166 has 8 divisors (see below), whose sum is σ = 40774344. Its totient is φ = 6795720.

The previous prime is 20387123. The next prime is 20387167. The reversal of 20387166 is 66178302.

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

20387166 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20387167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1698925 + ... + 1698936.

It is an arithmetic number, because the mean of its divisors is an integer number (5096793).

Almost surely, 2^20387166 is an apocalyptic number.

20387166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20387166 is a wasteful number, since it uses less digits than its factorization.

20387166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397866.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20387166 is about 4515.2149450497. The cubic root of 20387166 is about 273.1821296709.

The spelling of 20387166 in words is "twenty million, three hundred eighty-seven thousand, one hundred sixty-six".