19855044 has 84 divisors (see below), whose sum is σ = 56923440. Its totient is φ = 6006960.

The previous prime is 19855021. The next prime is 19855061. The reversal of 19855044 is 44055891.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 31767 + ... + 32385.

It is an arithmetic number, because the mean of its divisors is an integer number (677660).

Almost surely, 2^19855044 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 19855044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28461720).

19855044 is an abundant number, since it is smaller than the sum of its proper divisors (37068396).

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

19855044 is a wasteful number, since it uses less digits than its factorization.

19855044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 635 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 19855044 is about 4455.8999091093. The cubic root of 19855044 is about 270.7843857157.

The spelling of 19855044 in words is "nineteen million, eight hundred fifty-five thousand, forty-four".