19906944 has 64 divisors (see below), whose sum is σ = 54051840. Its totient is φ = 6488576.

The previous prime is 19906933. The next prime is 19906951. The reversal of 19906944 is 44960991.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 19906896 and 19906905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17497 + ... + 18599.

It is an arithmetic number, because the mean of its divisors is an integer number (844560).

Almost surely, 2^19906944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19906944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27025920).

19906944 is an abundant number, since it is smaller than the sum of its proper divisors (34144896).

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

19906944 is a wasteful number, since it uses less digits than its factorization.

19906944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167 (or 1155 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 19906944 is about 4461.7198477717. The cubic root of 19906944 is about 271.0201189658.

The spelling of 19906944 in words is "nineteen million, nine hundred six thousand, nine hundred forty-four".