20986814 has 8 divisors (see below), whose sum is σ = 32495808. Its totient is φ = 10154880.

The previous prime is 20986747. The next prime is 20986817. The reversal of 20986814 is 41868902.

20986814 is nontrivially palindromic in base 13.

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 (20986817) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 169187 + ... + 169310.

It is an arithmetic number, because the mean of its divisors is an integer number (4061976).

Almost surely, 2^20986814 is an apocalyptic number.

20986814 is a deficient number, since it is larger than the sum of its proper divisors (11508994).

20986814 is a wasteful number, since it uses less digits than its factorization.

20986814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338530.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 20986814 is about 4581.1367584913. The cubic root of 20986814 is about 275.8346608269.

The spelling of 20986814 in words is "twenty million, nine hundred eighty-six thousand, eight hundred fourteen".