20306866 has 16 divisors (see below), whose sum is σ = 30913344. Its totient is φ = 10003824.

The previous prime is 20306837. The next prime is 20306887. The reversal of 20306866 is 66860302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54256 + ... + 54628.

It is an arithmetic number, because the mean of its divisors is an integer number (1932084).

Almost surely, 2^20306866 is an apocalyptic number.

20306866 is a deficient number, since it is larger than the sum of its proper divisors (10606478).

20306866 is a wasteful number, since it uses less digits than its factorization.

20306866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 20306866 is about 4506.3140148019. The cubic root of 20306866 is about 272.8229921454.

The spelling of 20306866 in words is "twenty million, three hundred six thousand, eight hundred sixty-six".