20320668 has 18 divisors (see below), whose sum is σ = 51366224. Its totient is φ = 6773544.

The previous prime is 20320609. The next prime is 20320669. The reversal of 20320668 is 86602302.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320669) 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 5 ways as a sum of consecutive naturals, for example, 282196 + ... + 282267.

Almost surely, 2^20320668 is an apocalyptic number.

It is an amenable number.

20320668 is an abundant number, since it is smaller than the sum of its proper divisors (31045556).

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

20320668 is a wasteful number, since it uses less digits than its factorization.

20320668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564473 (or 564468 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20320668 is about 4507.8451614935. The cubic root of 20320668 is about 272.8847881599.

The spelling of 20320668 in words is "twenty million, three hundred twenty thousand, six hundred sixty-eight".