20686208 has 16 divisors (see below), whose sum is σ = 41211060. Its totient is φ = 10343040.

The previous prime is 20686201. The next prime is 20686241. The reversal of 20686208 is 80268602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686201) 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 as a sum of consecutive naturals, namely, 80678 + ... + 80933.

Almost surely, 2^20686208 is an apocalyptic number.

It is an amenable number.

20686208 is a deficient number, since it is larger than the sum of its proper divisors (20524852).

20686208 is an equidigital number, since it uses as much as digits as its factorization.

20686208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161625 (or 161613 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 20686208 is about 4548.2093179624. The cubic root of 20686208 is about 274.5113437758.

The spelling of 20686208 in words is "twenty million, six hundred eighty-six thousand, two hundred eight".