20945686 has 8 divisors (see below), whose sum is σ = 32784624. Its totient is φ = 10017480.

The previous prime is 20945651. The next prime is 20945693. The reversal of 20945686 is 68654902.

It is a happy number.

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, 227625 + ... + 227716.

It is an arithmetic number, because the mean of its divisors is an integer number (4098078).

Almost surely, 2^20945686 is an apocalyptic number.

20945686 is a deficient number, since it is larger than the sum of its proper divisors (11838938).

20945686 is a wasteful number, since it uses less digits than its factorization.

20945686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455366.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 20945686 is about 4576.6457149314. The cubic root of 20945686 is about 275.6543579844.

The spelling of 20945686 in words is "twenty million, nine hundred forty-five thousand, six hundred eighty-six".