20666473 has 8 divisors (see below), whose sum is σ = 21475080. Its totient is φ = 19864320.

The previous prime is 20666453. The next prime is 20666521. The reversal of 20666473 is 37466602.

It can be written as a sum of positive squares in 4 ways, for example, as 2663424 + 18003049 = 1632^2 + 4243^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20666473 - 2⁹ = 20665961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20666413) 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, 5511 + ... + 8467.

It is an arithmetic number, because the mean of its divisors is an integer number (2684385).

Almost surely, 2^20666473 is an apocalyptic number.

It is an amenable number.

20666473 is a deficient number, since it is larger than the sum of its proper divisors (808607).

20666473 is a wasteful number, since it uses less digits than its factorization.

20666473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 20666473 is about 4546.0392651186. The cubic root of 20666473 is about 274.4240198114.

The spelling of 20666473 in words is "twenty million, six hundred sixty-six thousand, four hundred seventy-three".