20808718 has 32 divisors (see below), whose sum is σ = 37324800. Its totient is φ = 8512224.

The previous prime is 20808713. The next prime is 20808737. The reversal of 20808718 is 81780802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808713) 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 in 15 ways as a sum of consecutive naturals, for example, 43203 + ... + 43681.

It is an arithmetic number, because the mean of its divisors is an integer number (1166400).

Almost surely, 2^20808718 is an apocalyptic number.

20808718 is a deficient number, since it is larger than the sum of its proper divisors (16516082).

20808718 is a wasteful number, since it uses less digits than its factorization.

20808718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 20808718 is about 4561.6573742446. The cubic root of 20808718 is about 275.0521906454.

The spelling of 20808718 in words is "twenty million, eight hundred eight thousand, seven hundred eighteen".