20641648 has 20 divisors (see below), whose sum is σ = 40845600. Its totient is φ = 10100864.

The previous prime is 20641633. The next prime is 20641661. The reversal of 20641648 is 84614602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12973 + ... + 14476.

It is an arithmetic number, because the mean of its divisors is an integer number (2042280).

Almost surely, 2^20641648 is an apocalyptic number.

It is an amenable number.

20641648 is a deficient number, since it is larger than the sum of its proper divisors (20203952).

20641648 is a wasteful number, since it uses less digits than its factorization.

20641648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27504 (or 27498 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20641648 is about 4543.3080459066. The cubic root of 20641648 is about 274.3140944923.

The spelling of 20641648 in words is "twenty million, six hundred forty-one thousand, six hundred forty-eight".