20808916 has 12 divisors (see below), whose sum is σ = 36877120. Its totient is φ = 10272600.

The previous prime is 20808889. The next prime is 20808919. The reversal of 20808916 is 61980802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32610 + ... + 33241.

Almost surely, 2^20808916 is an apocalyptic number.

It is an amenable number.

20808916 is a deficient number, since it is larger than the sum of its proper divisors (16068204).

20808916 is a wasteful number, since it uses less digits than its factorization.

20808916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65934 (or 65932 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 20808916 is about 4561.6790768312. The cubic root of 20808916 is about 275.0530630387.

The spelling of 20808916 in words is "twenty million, eight hundred eight thousand, nine hundred sixteen".