19838020 has 12 divisors (see below), whose sum is σ = 41659884. Its totient is φ = 7935200.

The previous prime is 19838003. The next prime is 19838051. The reversal of 19838020 is 2083891.

It can be written as a sum of positive squares in 2 ways, for example, as 10252804 + 9585216 = 3202^2 + 3096^2 .

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 3 ways as a sum of consecutive naturals, for example, 495931 + ... + 495970.

It is an arithmetic number, because the mean of its divisors is an integer number (3471657).

Almost surely, 2^19838020 is an apocalyptic number.

19838020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19838020 is an abundant number, since it is smaller than the sum of its proper divisors (21821864).

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

19838020 is a wasteful number, since it uses less digits than its factorization.

19838020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991910 (or 991908 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 19838020 is about 4453.9892231571. The cubic root of 19838020 is about 270.7069721120.

The spelling of 19838020 in words is "nineteen million, eight hundred thirty-eight thousand, twenty".