20686853 has 8 divisors (see below), whose sum is σ = 22905120. Its totient is φ = 18524880.

The previous prime is 20686847. The next prime is 20686871. The reversal of 20686853 is 35868602.

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

It is not a de Polignac number, because 20686853 - 2⁶ = 20686789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13298 + ... + 14771.

It is an arithmetic number, because the mean of its divisors is an integer number (2863140).

Almost surely, 2^20686853 is an apocalyptic number.

It is an amenable number.

20686853 is a deficient number, since it is larger than the sum of its proper divisors (2218267).

20686853 is a wasteful number, since it uses less digits than its factorization.

20686853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28147.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 20686853 is about 4548.2802244365. The cubic root of 20686853 is about 274.5141968519.

The spelling of 20686853 in words is "twenty million, six hundred eighty-six thousand, eight hundred fifty-three".