19806144 has 56 divisors (see below), whose sum is σ = 53644800. Its totient is φ = 6445824.

The previous prime is 19806131. The next prime is 19806181. The reversal of 19806144 is 44160891.

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, 7057 + ... + 9455.

Almost surely, 2^19806144 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 19806144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26822400).

19806144 is an abundant number, since it is smaller than the sum of its proper divisors (33838656).

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

19806144 is a wasteful number, since it uses less digits than its factorization.

19806144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457 (or 2447 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 19806144 is about 4450.4094193681. The cubic root of 19806144 is about 270.5619025044.

The spelling of 19806144 in words is "nineteen million, eight hundred six thousand, one hundred forty-four".