19905113 has 8 divisors (see below), whose sum is σ = 21195720. Its totient is φ = 18627840.

The previous prime is 19905101. The next prime is 19905121. The reversal of 19905113 is 31150991.

It can be written as a sum of positive squares in 4 ways, for example, as 120409 + 19784704 = 347^2 + 4448^2 .

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 19905113 - 2¹⁶ = 19839577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19905133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158 + ... + 6311.

It is an arithmetic number, because the mean of its divisors is an integer number (2649465).

Almost surely, 2^19905113 is an apocalyptic number.

It is an amenable number.

19905113 is a deficient number, since it is larger than the sum of its proper divisors (1290607).

19905113 is a wasteful number, since it uses less digits than its factorization.

19905113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6667.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 19905113 is about 4461.5146531195. The cubic root of 19905113 is about 271.0118094190.

The spelling of 19905113 in words is "nineteen million, nine hundred five thousand, one hundred thirteen".