20828688 has 20 divisors (see below), whose sum is σ = 53807568. Its totient is φ = 6942880.

The previous prime is 20828671. The next prime is 20828737. The reversal of 20828688 is 88682802.

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, 216918 + ... + 217013.

Almost surely, 2^20828688 is an apocalyptic number.

It is an amenable number.

20828688 is an abundant number, since it is smaller than the sum of its proper divisors (32978880).

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

20828688 is a wasteful number, since it uses less digits than its factorization.

20828688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433942 (or 433936 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The square root of 20828688 is about 4563.8457467360. The cubic root of 20828688 is about 275.1401511507.

The spelling of 20828688 in words is "twenty million, eight hundred twenty-eight thousand, six hundred eighty-eight".