20866016 has 12 divisors (see below), whose sum is σ = 41080032. Its totient is φ = 10432992.

The previous prime is 20865997. The next prime is 20866031. The reversal of 20866016 is 61066802.

It is a self number, because there is not a number n which added to its sum of digits gives 20866016.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 326000 + ... + 326063.

It is an arithmetic number, because the mean of its divisors is an integer number (3423336).

Almost surely, 2^20866016 is an apocalyptic number.

It is an amenable number.

20866016 is a deficient number, since it is larger than the sum of its proper divisors (20214016).

20866016 is an equidigital number, since it uses as much as digits as its factorization.

20866016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652073 (or 652065 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20866016 is about 4567.9334496028. The cubic root of 20866016 is about 275.3044166148.

The spelling of 20866016 in words is "twenty million, eight hundred sixty-six thousand, sixteen".