20840086 has 8 divisors (see below), whose sum is σ = 31316040. Its totient is φ = 10401408.

The previous prime is 20840063. The next prime is 20840087. The reversal of 20840086 is 68004802.

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 (20840087) 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, 7876 + ... + 10183.

It is an arithmetic number, because the mean of its divisors is an integer number (3914505).

Almost surely, 2^20840086 is an apocalyptic number.

20840086 is a deficient number, since it is larger than the sum of its proper divisors (10475954).

20840086 is a wasteful number, since it uses less digits than its factorization.

20840086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18638.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20840086 is about 4565.0943035166. The cubic root of 20840086 is about 275.1903299485.

Adding to 20840086 its reverse (68004802), we get a palindrome (88844888).

The spelling of 20840086 in words is "twenty million, eight hundred forty thousand, eighty-six".