20805086 has 8 divisors (see below), whose sum is σ = 31271184. Its totient is φ = 10381360.

The previous prime is 20805049. The next prime is 20805089. The reversal of 20805086 is 68050802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20805089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9335 + ... + 11346.

It is an arithmetic number, because the mean of its divisors is an integer number (3908898).

Almost surely, 2^20805086 is an apocalyptic number.

20805086 is a deficient number, since it is larger than the sum of its proper divisors (10466098).

20805086 is a wasteful number, since it uses less digits than its factorization.

20805086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21186.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 20805086 is about 4561.2592559511. The cubic root of 20805086 is about 275.0361869735.

Adding to 20805086 its reverse (68050802), we get a palindrome (88855888).

The spelling of 20805086 in words is "twenty million, eight hundred five thousand, eighty-six".