20660668 has 18 divisors (see below), whose sum is σ = 41369496. Its totient is φ = 8844264.

The previous prime is 20660659. The next prime is 20660669. The reversal of 20660668 is 86606602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660669) 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 5 ways as a sum of consecutive naturals, for example, 23623 + ... + 24481.

Almost surely, 2^20660668 is an apocalyptic number.

20660668 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20660668 is an abundant number, since it is smaller than the sum of its proper divisors (20708828).

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

20660668 is an frugal number, since it uses more digits than its factorization.

20660668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 20660668 is about 4545.4007524090. The cubic root of 20660668 is about 274.3983231091.

The spelling of 20660668 in words is "twenty million, six hundred sixty thousand, six hundred sixty-eight".