20666928 has 40 divisors (see below), whose sum is σ = 53554608. Its totient is φ = 6867712.

The previous prime is 20666869. The next prime is 20666929. The reversal of 20666928 is 82966602.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20666929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26350 + ... + 27122.

Almost surely, 2^20666928 is an apocalyptic number.

It is an amenable number.

20666928 is an abundant number, since it is smaller than the sum of its proper divisors (32887680).

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

20666928 is a wasteful number, since it uses less digits than its factorization.

20666928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341 (or 1335 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 20666928 is about 4546.0893084056. The cubic root of 20666928 is about 274.4260337337.

The spelling of 20666928 in words is "twenty million, six hundred sixty-six thousand, nine hundred twenty-eight".