20388686 has 8 divisors (see below), whose sum is σ = 30718440. Its totient is φ = 10149208.

The previous prime is 20388583. The next prime is 20388727. The reversal of 20388686 is 68688302.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22001 + ... + 22908.

It is an arithmetic number, because the mean of its divisors is an integer number (3839805).

Almost surely, 2^20388686 is an apocalyptic number.

20388686 is a deficient number, since it is larger than the sum of its proper divisors (10329754).

20388686 is a wasteful number, since it uses less digits than its factorization.

20388686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45138.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 20388686 is about 4515.3832616955. The cubic root of 20388686 is about 273.1889186890.

The spelling of 20388686 in words is "twenty million, three hundred eighty-eight thousand, six hundred eighty-six".