20666894 has 8 divisors (see below), whose sum is σ = 32000448. Its totient is φ = 10000080.

The previous prime is 20666869. The next prime is 20666929. The reversal of 20666894 is 49866602.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166607 + ... + 166730.

It is an arithmetic number, because the mean of its divisors is an integer number (4000056).

Almost surely, 2^20666894 is an apocalyptic number.

20666894 is a deficient number, since it is larger than the sum of its proper divisors (11333554).

20666894 is a wasteful number, since it uses less digits than its factorization.

20666894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333370.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 20666894 is about 4546.0855689263. The cubic root of 20666894 is about 274.4258832438.

The spelling of 20666894 in words is "twenty million, six hundred sixty-six thousand, eight hundred ninety-four".