19945772 has 48 divisors (see below), whose sum is σ = 44943360. Its totient is φ = 7516800.

The previous prime is 19945771. The next prime is 19945781. The reversal of 19945772 is 27754991.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (19945771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8504 + ... + 10592.

It is an arithmetic number, because the mean of its divisors is an integer number (936320).

Almost surely, 2^19945772 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 19945772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22471680).

19945772 is an abundant number, since it is smaller than the sum of its proper divisors (24997588).

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

19945772 is a wasteful number, since it uses less digits than its factorization.

19945772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142 (or 2140 counting only the distinct ones).

The product of its digits is 158760, while the sum is 44.

The square root of 19945772 is about 4466.0689649848. The cubic root of 19945772 is about 271.1962105323.

The spelling of 19945772 in words is "nineteen million, nine hundred forty-five thousand, seven hundred seventy-two".