20868808 has 8 divisors (see below), whose sum is σ = 39129030. Its totient is φ = 10434400.

The previous prime is 20868769. The next prime is 20868823. The reversal of 20868808 is 80886802.

It can be written as a sum of positive squares in only one way, i.e., 20232004 + 636804 = 4498^2 + 798^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1304293 + ... + 1304308.

Almost surely, 2^20868808 is an apocalyptic number.

It is an amenable number.

20868808 is a deficient number, since it is larger than the sum of its proper divisors (18260222).

20868808 is a wasteful number, since it uses less digits than its factorization.

20868808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608607 (or 2608603 counting only the distinct ones).

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

The square root of 20868808 is about 4568.2390480359. The cubic root of 20868808 is about 275.3166952029.

The spelling of 20868808 in words is "twenty million, eight hundred sixty-eight thousand, eight hundred eight".