20684648 has 16 divisors (see below), whose sum is σ = 41065380. Its totient is φ = 9733888.

The previous prime is 20684647. The next prime is 20684663. The reversal of 20684648 is 84648602.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20593444 + 91204 = 4538^2 + 302^2 .

It is not an unprimeable number, because it can be changed into a prime (20684641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75911 + ... + 76182.

Almost surely, 2^20684648 is an apocalyptic number.

It is an amenable number.

20684648 is a deficient number, since it is larger than the sum of its proper divisors (20380732).

20684648 is a wasteful number, since it uses less digits than its factorization.

20684648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152116 (or 152112 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 20684648 is about 4548.0378186642. The cubic root of 20684648 is about 274.5044430675.

The spelling of 20684648 in words is "twenty million, six hundred eighty-four thousand, six hundred forty-eight".