20668976 has 20 divisors (see below), whose sum is σ = 40423752. Its totient is φ = 10237056.

The previous prime is 20668931. The next prime is 20668997. The reversal of 20668976 is 67986602.

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 3 ways as a sum of consecutive naturals, for example, 4325 + ... + 7748.

Almost surely, 2^20668976 is an apocalyptic number.

It is an amenable number.

20668976 is a deficient number, since it is larger than the sum of its proper divisors (19754776).

20668976 is a wasteful number, since it uses less digits than its factorization.

20668976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12188 (or 12182 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 20668976 is about 4546.3145513702. The cubic root of 20668976 is about 274.4350982312.

The spelling of 20668976 in words is "twenty million, six hundred sixty-eight thousand, nine hundred seventy-six".