19045820 has 12 divisors (see below), whose sum is σ = 39996264. Its totient is φ = 7618320.

The previous prime is 19045801. The next prime is 19045841. The reversal of 19045820 is 2854091.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476126 + ... + 476165.

It is an arithmetic number, because the mean of its divisors is an integer number (3333022).

Almost surely, 2^19045820 is an apocalyptic number.

19045820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19045820 is an abundant number, since it is smaller than the sum of its proper divisors (20950444).

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

19045820 is a wasteful number, since it uses less digits than its factorization.

19045820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952300 (or 952298 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 19045820 is about 4364.1516930556. The cubic root of 19045820 is about 267.0544947146.

The spelling of 19045820 in words is "nineteen million, forty-five thousand, eight hundred twenty".