20808886 has 8 divisors (see below), whose sum is σ = 35672400. Its totient is φ = 8918088.

The previous prime is 20808883. The next prime is 20808889. The reversal of 20808886 is 68880802.

It is an interprime number because it is at equal distance from previous prime (20808883) and next prime (20808889).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808881) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 743161 + ... + 743188.

It is an arithmetic number, because the mean of its divisors is an integer number (4459050).

Almost surely, 2^20808886 is an apocalyptic number.

20808886 is a deficient number, since it is larger than the sum of its proper divisors (14863514).

20808886 is a wasteful number, since it uses less digits than its factorization.

20808886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486358.

The product of its (nonzero) digits is 49152, while the sum is 40.

The square root of 20808886 is about 4561.6757885672. The cubic root of 20808886 is about 275.0529308583.

The spelling of 20808886 in words is "twenty million, eight hundred eight thousand, eight hundred eighty-six".