20666976 has 48 divisors (see below), whose sum is σ = 59185728. Its totient is φ = 6262400.

The previous prime is 20666963. The next prime is 20666999. The reversal of 20666976 is 67966602.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8730 + ... + 10841.

It is an arithmetic number, because the mean of its divisors is an integer number (1233036).

Almost surely, 2^20666976 is an apocalyptic number.

It is an amenable number.

20666976 is an abundant number, since it is smaller than the sum of its proper divisors (38518752).

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

20666976 is a wasteful number, since it uses less digits than its factorization.

20666976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19595 (or 19587 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 20666976 is about 4546.0945876653. The cubic root of 20666976 is about 274.4262461897.

The spelling of 20666976 in words is "twenty million, six hundred sixty-six thousand, nine hundred seventy-six".