20864168 has 32 divisors (see below), whose sum is σ = 44611560. Its totient is φ = 9062400.

The previous prime is 20864161. The next prime is 20864171. The reversal of 20864168 is 86146802.

It can be written as a sum of positive squares in 4 ways, for example, as 17322244 + 3541924 = 4162^2 + 1882^2 .

It is not an unprimeable number, because it can be changed into a prime (20864161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4133 + ... + 7668.

Almost surely, 2^20864168 is an apocalyptic number.

It is an amenable number.

20864168 is an abundant number, since it is smaller than the sum of its proper divisors (23747392).

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

20864168 is a wasteful number, since it uses less digits than its factorization.

20864168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11837 (or 11833 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 20864168 is about 4567.7311654694. The cubic root of 20864168 is about 275.2962889239.

The spelling of 20864168 in words is "twenty million, eight hundred sixty-four thousand, one hundred sixty-eight".