19745109 has 48 divisors (see below), whose sum is σ = 32707584. Its totient is φ = 11404800.

The previous prime is 19745083. The next prime is 19745111. The reversal of 19745109 is 90154791.

It is not a de Polignac number, because 19745109 - 2⁷ = 19744981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19745179) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 108999 + ... + 109179.

It is an arithmetic number, because the mean of its divisors is an integer number (681408).

Almost surely, 2^19745109 is an apocalyptic number.

It is an amenable number.

19745109 is a deficient number, since it is larger than the sum of its proper divisors (12962475).

19745109 is a wasteful number, since it uses less digits than its factorization.

19745109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 19745109 is about 4443.5468940926. The cubic root of 19745109 is about 270.2836935835.

The spelling of 19745109 in words is "nineteen million, seven hundred forty-five thousand, one hundred nine".