20688786 has 24 divisors (see below), whose sum is σ = 45264960. Its totient is φ = 6828696.

The previous prime is 20688751. The next prime is 20688817. The reversal of 20688786 is 68788602.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3726 + ... + 7433.

It is an arithmetic number, because the mean of its divisors is an integer number (1886040).

Almost surely, 2^20688786 is an apocalyptic number.

20688786 is an abundant number, since it is smaller than the sum of its proper divisors (24576174).

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

20688786 is a wasteful number, since it uses less digits than its factorization.

20688786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11270 (or 11267 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 20688786 is about 4548.4927173735. The cubic root of 20688786 is about 274.5227468783.

The spelling of 20688786 in words is "twenty million, six hundred eighty-eight thousand, seven hundred eighty-six".