20685219 has 8 divisors (see below), whose sum is σ = 27782160. Its totient is φ = 13689216.

The previous prime is 20685199. The next prime is 20685227. The reversal of 20685219 is 91258602.

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

It is not a de Polignac number, because 20685219 - 2⁵ = 20685187 is a prime.

It is a super-2 number, since 2×20685219² = 855756570155922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 20685219.

It is not an unprimeable number, because it can be changed into a prime (20685239) 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 7 ways as a sum of consecutive naturals, for example, 24754 + ... + 25575.

It is an arithmetic number, because the mean of its divisors is an integer number (3472770).

Almost surely, 2^20685219 is an apocalyptic number.

20685219 is a deficient number, since it is larger than the sum of its proper divisors (7096941).

20685219 is a wasteful number, since it uses less digits than its factorization.

20685219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50469.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 20685219 is about 4548.1005925551. The cubic root of 20685219 is about 274.5069689439.

The spelling of 20685219 in words is "twenty million, six hundred eighty-five thousand, two hundred nineteen".