20666458 has 8 divisors (see below), whose sum is σ = 32823252. Its totient is φ = 9725376.

The previous prime is 20666453. The next prime is 20666521. The reversal of 20666458 is 85466602.

It can be written as a sum of positive squares in 2 ways, for example, as 20403289 + 263169 = 4517^2 + 513^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20666453) 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 3 ways as a sum of consecutive naturals, for example, 303885 + ... + 303952.

Almost surely, 2^20666458 is an apocalyptic number.

20666458 is a deficient number, since it is larger than the sum of its proper divisors (12156794).

20666458 is a wasteful number, since it uses less digits than its factorization.

20666458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607856.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 20666458 is about 4546.0376153305. The cubic root of 20666458 is about 274.4239534179.

The spelling of 20666458 in words is "twenty million, six hundred sixty-six thousand, four hundred fifty-eight".