20668968 has 48 divisors (see below), whose sum is σ = 56246580. Its totient is φ = 6856704.

The previous prime is 20668931. The next prime is 20668997. The reversal of 20668968 is 86986602.

It can be written as a sum of positive squares in 2 ways, for example, as 20629764 + 39204 = 4542^2 + 198^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 17946 + ... + 19062.

Almost surely, 2^20668968 is an apocalyptic number.

It is an amenable number.

20668968 is an abundant number, since it is smaller than the sum of its proper divisors (35577612).

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

20668968 is a wasteful number, since it uses less digits than its factorization.

20668968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386 (or 1379 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 20668968 is about 4546.3136715365. The cubic root of 20668968 is about 274.4350628242.

The spelling of 20668968 in words is "twenty million, six hundred sixty-eight thousand, nine hundred sixty-eight".