20578648 has 16 divisors (see below), whose sum is σ = 39161880. Its totient is φ = 10135488.

The previous prime is 20578643. The next prime is 20578693. The reversal of 20578648 is 84687502.

It is a self number, because there is not a number n which added to its sum of digits gives 20578648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20578643) 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, 18661 + ... + 19732.

Almost surely, 2^20578648 is an apocalyptic number.

It is an amenable number.

20578648 is a deficient number, since it is larger than the sum of its proper divisors (18583232).

20578648 is a wasteful number, since it uses less digits than its factorization.

20578648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38466 (or 38462 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 20578648 is about 4536.3694734887. The cubic root of 20578648 is about 274.0347337288.

The spelling of 20578648 in words is "twenty million, five hundred seventy-eight thousand, six hundred forty-eight".