19803813 has 8 divisors (see below), whose sum is σ = 26460000. Its totient is φ = 13175088.

The previous prime is 19803803. The next prime is 19803841. The reversal of 19803813 is 31830891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19803813 - 2⁸ = 19803557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19803803) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5118 + ... + 8111.

It is an arithmetic number, because the mean of its divisors is an integer number (3307500).

Almost surely, 2^19803813 is an apocalyptic number.

It is an amenable number.

19803813 is a deficient number, since it is larger than the sum of its proper divisors (6656187).

19803813 is a wasteful number, since it uses less digits than its factorization.

19803813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13731.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 19803813 is about 4450.1475256445. The cubic root of 19803813 is about 270.5512878766.

The spelling of 19803813 in words is "nineteen million, eight hundred three thousand, eight hundred thirteen".