20866408 has 16 divisors (see below), whose sum is σ = 41184000. Its totient is φ = 9884016.

The previous prime is 20866387. The next prime is 20866411. The reversal of 20866408 is 80466802.

It is an unprimeable number.

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, 68488 + ... + 68791.

It is an arithmetic number, because the mean of its divisors is an integer number (2574000).

Almost surely, 2^20866408 is an apocalyptic number.

It is an amenable number.

20866408 is a deficient number, since it is larger than the sum of its proper divisors (20317592).

20866408 is a wasteful number, since it uses less digits than its factorization.

20866408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137304 (or 137300 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 20866408 is about 4567.9763572068. The cubic root of 20866408 is about 275.3061406087.

The spelling of 20866408 in words is "twenty million, eight hundred sixty-six thousand, four hundred eight".