20866928 has 10 divisors (see below), whose sum is σ = 40429704. Its totient is φ = 10433456.

The previous prime is 20866913. The next prime is 20866933. The reversal of 20866928 is 82966802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652076 + ... + 652107.

Almost surely, 2^20866928 is an apocalyptic number.

It is an amenable number.

20866928 is a deficient number, since it is larger than the sum of its proper divisors (19562776).

20866928 is a wasteful number, since it uses less digits than its factorization.

20866928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304191 (or 1304185 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 20866928 is about 4568.0332748350. The cubic root of 20866928 is about 275.3084275061.

The spelling of 20866928 in words is "twenty million, eight hundred sixty-six thousand, nine hundred twenty-eight".