19997442 has 48 divisors (see below), whose sum is σ = 46912320. Its totient is φ = 6372432.

The previous prime is 19997441. The next prime is 19997459. The reversal of 19997442 is 24479991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19997441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10284 + ... + 12072.

It is an arithmetic number, because the mean of its divisors is an integer number (977340).

Almost surely, 2^19997442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19997442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23456160).

19997442 is an abundant number, since it is smaller than the sum of its proper divisors (26914878).

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

19997442 is a wasteful number, since it uses less digits than its factorization.

19997442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829 (or 1817 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 19997442 is about 4471.8499527600. The cubic root of 19997442 is about 271.4301886990.

The spelling of 19997442 in words is "nineteen million, nine hundred ninety-seven thousand, four hundred forty-two".