20857568 has 24 divisors (see below), whose sum is σ = 41563368. Its totient is φ = 10301824.

The previous prime is 20857559. The next prime is 20857579. The reversal of 20857568 is 86575802.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1271 + ... + 6582.

It is an arithmetic number, because the mean of its divisors is an integer number (1731807).

Almost surely, 2^20857568 is an apocalyptic number.

It is an amenable number.

20857568 is a deficient number, since it is larger than the sum of its proper divisors (20705800).

20857568 is an equidigital number, since it uses as much as digits as its factorization.

20857568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7946 (or 7938 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 20857568 is about 4567.0086489955. The cubic root of 20857568 is about 275.2672575382.

The spelling of 20857568 in words is "twenty million, eight hundred fifty-seven thousand, five hundred sixty-eight".