20678885 has 16 divisors (see below), whose sum is σ = 27183600. Its totient is φ = 15031296.

The previous prime is 20678873. The next prime is 20678899. The reversal of 20678885 is 58887602.

It can be written as a sum of positive squares in 8 ways, for example, as 1747684 + 18931201 = 1322^2 + 4351^2 .

It is a cyclic number.

It is not a de Polignac number, because 20678885 - 2⁸ = 20678629 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1730 + ... + 6659.

It is an arithmetic number, because the mean of its divisors is an integer number (1698975).

Almost surely, 2^20678885 is an apocalyptic number.

It is an amenable number.

20678885 is a deficient number, since it is larger than the sum of its proper divisors (6504715).

20678885 is a wasteful number, since it uses less digits than its factorization.

20678885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8440.

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 20678885 is about 4547.4042045985. The cubic root of 20678885 is about 274.4789472498.

The spelling of 20678885 in words is "twenty million, six hundred seventy-eight thousand, eight hundred eighty-five".