20688168 has 32 divisors (see below), whose sum is σ = 52228800. Its totient is φ = 6828288.

The previous prime is 20688121. The next prime is 20688197. The reversal of 20688168 is 86188602.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 1713 + ... + 6656.

It is an arithmetic number, because the mean of its divisors is an integer number (1632150).

Almost surely, 2^20688168 is an apocalyptic number.

It is an amenable number.

20688168 is an abundant number, since it is smaller than the sum of its proper divisors (31540632).

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

20688168 is a wasteful number, since it uses less digits than its factorization.

20688168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8481 (or 8477 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 20688168 is about 4548.4247822735. The cubic root of 20688168 is about 274.5200134047.

The spelling of 20688168 in words is "twenty million, six hundred eighty-eight thousand, one hundred sixty-eight".