20805286 has 16 divisors (see below), whose sum is σ = 32104800. Its totient is φ = 10105920.

The previous prime is 20805259. The next prime is 20805287. The reversal of 20805286 is 68250802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20805287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28255 + ... + 28981.

It is an arithmetic number, because the mean of its divisors is an integer number (2006550).

Almost surely, 2^20805286 is an apocalyptic number.

20805286 is a deficient number, since it is larger than the sum of its proper divisors (11299514).

20805286 is a wasteful number, since it uses less digits than its factorization.

20805286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20805286 is about 4561.2811796687. The cubic root of 20805286 is about 275.0370682814.

The spelling of 20805286 in words is "twenty million, eight hundred five thousand, two hundred eighty-six".