20647216 has 20 divisors (see below), whose sum is σ = 40374400. Its totient is φ = 10228032.

The previous prime is 20647201. The next prime is 20647229. The reversal of 20647216 is 61274602.

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, 4176 + ... + 7663.

It is an arithmetic number, because the mean of its divisors is an integer number (2018720).

Almost surely, 2^20647216 is an apocalyptic number.

It is an amenable number.

20647216 is a deficient number, since it is larger than the sum of its proper divisors (19727184).

20647216 is a wasteful number, since it uses less digits than its factorization.

20647216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11956 (or 11950 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20647216 is about 4543.9207739572. The cubic root of 20647216 is about 274.3387573094.

The spelling of 20647216 in words is "twenty million, six hundred forty-seven thousand, two hundred sixteen".