19856648 has 32 divisors (see below), whose sum is σ = 44020800. Its totient is φ = 8215872.

The previous prime is 19856633. The next prime is 19856687. The reversal of 19856648 is 84665891.

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 in 7 ways as a sum of consecutive naturals, for example, 4490 + ... + 7737.

It is an arithmetic number, because the mean of its divisors is an integer number (1375650).

Almost surely, 2^19856648 is an apocalyptic number.

It is an amenable number.

19856648 is an abundant number, since it is smaller than the sum of its proper divisors (24164152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19856648 is a wasteful number, since it uses less digits than its factorization.

19856648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12269 (or 12265 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 19856648 is about 4456.0798915639. The cubic root of 19856648 is about 270.7916773383.

The spelling of 19856648 in words is "nineteen million, eight hundred fifty-six thousand, six hundred forty-eight".