20668458 has 8 divisors (see below), whose sum is σ = 41336928. Its totient is φ = 6889484.

The previous prime is 20668451. The next prime is 20668477. The reversal of 20668458 is 85486602.

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

20668458 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20668451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1722366 + ... + 1722377.

It is an arithmetic number, because the mean of its divisors is an integer number (5167116).

Almost surely, 2^20668458 is an apocalyptic number.

20668458 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20668458 is a wasteful number, since it uses less digits than its factorization.

20668458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444748.

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 20668458 is about 4546.2575817919. The cubic root of 20668458 is about 274.4328056073.

The spelling of 20668458 in words is "twenty million, six hundred sixty-eight thousand, four hundred fifty-eight".