19928430 has 96 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 5186592.

The previous prime is 19928401. The next prime is 19928453. The reversal of 19928430 is 3482991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 143301 + ... + 143439.

It is an arithmetic number, because the mean of its divisors is an integer number (573300).

Almost surely, 2^19928430 is an apocalyptic number.

19928430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19928430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27518400).

19928430 is an abundant number, since it is smaller than the sum of its proper divisors (35108370).

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

19928430 is a wasteful number, since it uses less digits than its factorization.

19928430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 19928430 is about 4464.1270143221. The cubic root of 19928430 is about 271.1175898872.

The spelling of 19928430 in words is "nineteen million, nine hundred twenty-eight thousand, four hundred thirty".