19906644 has 24 divisors (see below), whose sum is σ = 48051360. Its totient is φ = 6406624.

The previous prime is 19906639. The next prime is 19906651. The reversal of 19906644 is 44660991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28254 + ... + 28949.

It is an arithmetic number, because the mean of its divisors is an integer number (2002140).

Almost surely, 2^19906644 is an apocalyptic number.

It is an amenable number.

19906644 is an abundant number, since it is smaller than the sum of its proper divisors (28144716).

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

19906644 is a wasteful number, since it uses less digits than its factorization.

19906644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57239 (or 57237 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 19906644 is about 4461.6862283222. The cubic root of 19906644 is about 271.0187575239.

The spelling of 19906644 in words is "nineteen million, nine hundred six thousand, six hundred forty-four".