20660806 has 16 divisors (see below), whose sum is σ = 31505040. Its totient is φ = 10160640.

The previous prime is 20660779. The next prime is 20660813. The reversal of 20660806 is 60806602.

It is a happy number.

It is a congruent 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, 54325 + ... + 54703.

It is an arithmetic number, because the mean of its divisors is an integer number (1969065).

Almost surely, 2^20660806 is an apocalyptic number.

20660806 is a deficient number, since it is larger than the sum of its proper divisors (10844234).

20660806 is a wasteful number, since it uses less digits than its factorization.

20660806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20660806 is about 4545.4159325633. The cubic root of 20660806 is about 274.3989340426.

The spelling of 20660806 in words is "twenty million, six hundred sixty thousand, eight hundred six".