19945648 has 20 divisors (see below), whose sum is σ = 39892288. Its totient is φ = 9650880.

The previous prime is 19945621. The next prime is 19945691. The reversal of 19945648 is 84654991.

It is a happy number.

19945648 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 19945598 and 19945607.

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, 19611 + ... + 20602.

Almost surely, 2^19945648 is an apocalyptic number.

It is an amenable number.

19945648 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19945648 is a wasteful number, since it uses less digits than its factorization.

19945648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40252 (or 40246 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 19945648 is about 4466.0550825085. The cubic root of 19945648 is about 271.1956485352.

The spelling of 19945648 in words is "nineteen million, nine hundred forty-five thousand, six hundred forty-eight".