19800445 has 8 divisors (see below), whose sum is σ = 27154944. Its totient is φ = 13577424.

The previous prime is 19800421. The next prime is 19800463. The reversal of 19800445 is 54400891.

It is a happy number.

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

It is not a de Polignac number, because 19800445 - 2⁷ = 19800317 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 282829 + ... + 282898.

It is an arithmetic number, because the mean of its divisors is an integer number (3394368).

Almost surely, 2^19800445 is an apocalyptic number.

It is an amenable number.

19800445 is a deficient number, since it is larger than the sum of its proper divisors (7354499).

19800445 is an equidigital number, since it uses as much as digits as its factorization.

19800445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565739.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 19800445 is about 4449.7690951329. The cubic root of 19800445 is about 270.5359496115.

The spelling of 19800445 in words is "nineteen million, eight hundred thousand, four hundred forty-five".