20688888 has 32 divisors (see below), whose sum is σ = 56424960. Its totient is φ = 6269280.

The previous prime is 20688869. The next prime is 20688907. The reversal of 20688888 is 88888602.

It is an interprime number because it is at equal distance from previous prime (20688869) and next prime (20688907).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38920 + ... + 39447.

It is an arithmetic number, because the mean of its divisors is an integer number (1763280).

Almost surely, 2^20688888 is an apocalyptic number.

It is an amenable number.

20688888 is an abundant number, since it is smaller than the sum of its proper divisors (35736072).

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

20688888 is a wasteful number, since it uses less digits than its factorization.

20688888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78387 (or 78383 counting only the distinct ones).

The product of its (nonzero) digits is 393216, while the sum is 48.

The square root of 20688888 is about 4548.5039298653. The cubic root of 20688888 is about 274.5231980289.

The spelling of 20688888 in words is "twenty million, six hundred eighty-eight thousand, eight hundred eighty-eight".