19904442 has 32 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 6429360.

The previous prime is 19904429. The next prime is 19904471. The reversal of 19904442 is 24440991.

It is a super-2 number, since 2×19904442² = 792373622662728, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45967 + ... + 46397.

It is an arithmetic number, because the mean of its divisors is an integer number (1283040).

Almost surely, 2^19904442 is an apocalyptic number.

19904442 is an abundant number, since it is smaller than the sum of its proper divisors (21152838).

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

19904442 is a wasteful number, since it uses less digits than its factorization.

19904442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 19904442 is about 4461.4394538086. The cubic root of 19904442 is about 271.0087641216.

The spelling of 19904442 in words is "nineteen million, nine hundred four thousand, four hundred forty-two".