20916686 has 8 divisors (see below), whose sum is σ = 35857200. Its totient is φ = 8964288.

The previous prime is 20916673. The next prime is 20916689. The reversal of 20916686 is 68661902.

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 (20916689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747011 + ... + 747038.

It is an arithmetic number, because the mean of its divisors is an integer number (4482150).

Almost surely, 2^20916686 is an apocalyptic number.

20916686 is a deficient number, since it is larger than the sum of its proper divisors (14940514).

20916686 is a wasteful number, since it uses less digits than its factorization.

20916686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494058.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 20916686 is about 4573.4763583078. The cubic root of 20916686 is about 275.5270816798.

The spelling of 20916686 in words is "twenty million, nine hundred sixteen thousand, six hundred eighty-six".