20866693 has 8 divisors (see below), whose sum is σ = 22161600. Its totient is φ = 19591488.

The previous prime is 20866691. The next prime is 20866711. The reversal of 20866693 is 39666802.

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

It is not a de Polignac number, because 20866693 - 2¹ = 20866691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866691) 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, 2713 + ... + 7006.

It is an arithmetic number, because the mean of its divisors is an integer number (2770200).

Almost surely, 2^20866693 is an apocalyptic number.

It is an amenable number.

20866693 is a deficient number, since it is larger than the sum of its proper divisors (1294907).

20866693 is a wasteful number, since it uses less digits than its factorization.

20866693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9851.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 20866693 is about 4568.0075525332. The cubic root of 20866693 is about 275.3073940091.

The spelling of 20866693 in words is "twenty million, eight hundred sixty-six thousand, six hundred ninety-three".