19905853 has 8 divisors (see below), whose sum is σ = 21888000. Its totient is φ = 17952480.

The previous prime is 19905839. The next prime is 19905881. The reversal of 19905853 is 35850991.

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

It is a cyclic number.

It is not a de Polignac number, because 19905853 - 2⁹ = 19905341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19905653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5728 + ... + 8521.

It is an arithmetic number, because the mean of its divisors is an integer number (2736000).

Almost surely, 2^19905853 is an apocalyptic number.

It is an amenable number.

19905853 is a deficient number, since it is larger than the sum of its proper divisors (1982147).

19905853 is a wasteful number, since it uses less digits than its factorization.

19905853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14387.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 19905853 is about 4461.5975838258. The cubic root of 19905853 is about 271.0151677898.

The spelling of 19905853 in words is "nineteen million, nine hundred five thousand, eight hundred fifty-three".