20908808 has 8 divisors (see below), whose sum is σ = 39204030. Its totient is φ = 10454400.

The previous prime is 20908807. The next prime is 20908831. The reversal of 20908808 is 80880902.

It can be written as a sum of positive squares in only one way, i.e., 16337764 + 4571044 = 4042^2 + 2138^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20908807) by changing a digit.

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 as a sum of consecutive naturals, namely, 1306793 + ... + 1306808.

Almost surely, 2^20908808 is an apocalyptic number.

It is an amenable number.

20908808 is a deficient number, since it is larger than the sum of its proper divisors (18295222).

20908808 is a wasteful number, since it uses less digits than its factorization.

20908808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613607 (or 2613603 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 20908808 is about 4572.6150067549. The cubic root of 20908808 is about 275.4924860956.

The spelling of 20908808 in words is "twenty million, nine hundred eight thousand, eight hundred eight".