20915168 has 24 divisors (see below), whose sum is σ = 43600032. Its totient is φ = 9842176.

The previous prime is 20915123. The next prime is 20915179. The reversal of 20915168 is 86151902.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 18680 + ... + 19767.

It is an arithmetic number, because the mean of its divisors is an integer number (1816668).

Almost surely, 2^20915168 is an apocalyptic number.

It is an amenable number.

20915168 is an abundant number, since it is smaller than the sum of its proper divisors (22684864).

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

20915168 is a wasteful number, since it uses less digits than its factorization.

20915168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38474 (or 38466 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 20915168 is about 4573.3103983876. The cubic root of 20915168 is about 275.5204161844.

The spelling of 20915168 in words is "twenty million, nine hundred fifteen thousand, one hundred sixty-eight".