20808266 has 16 divisors (see below), whose sum is σ = 31921344. Its totient is φ = 10170624.

The previous prime is 20808251. The next prime is 20808301. The reversal of 20808266 is 66280802.

It is a happy number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 16490 + ... + 17706.

It is an arithmetic number, because the mean of its divisors is an integer number (1995084).

Almost surely, 2^20808266 is an apocalyptic number.

20808266 is a deficient number, since it is larger than the sum of its proper divisors (11113078).

20808266 is a wasteful number, since it uses less digits than its factorization.

20808266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 20808266 is about 4561.6078305790. The cubic root of 20808266 is about 275.0501991005.

The spelling of 20808266 in words is "twenty million, eight hundred eight thousand, two hundred sixty-six".