20387168 has 36 divisors (see below), whose sum is σ = 41248620. Its totient is φ = 9918720.

The previous prime is 20387167. The next prime is 20387179. The reversal of 20387168 is 86178302.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53603 + ... + 53981.

It is an arithmetic number, because the mean of its divisors is an integer number (1145795).

Almost surely, 2^20387168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20387168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20624310).

20387168 is an abundant number, since it is smaller than the sum of its proper divisors (20861452).

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

20387168 is an equidigital number, since it uses as much as digits as its factorization.

20387168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20387168 is about 4515.2151665231. The cubic root of 20387168 is about 273.1821386041.

The spelling of 20387168 in words is "twenty million, three hundred eighty-seven thousand, one hundred sixty-eight".