19520009 has 4 divisors (see below), whose sum is σ = 19622400. Its totient is φ = 19417620.

The previous prime is 19520003. The next prime is 19520021. The reversal of 19520009 is 90002591.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90002591 = 7 ⋅12857513.

It is a cyclic number.

It is not a de Polignac number, because 19520009 - 2²⁰ = 18471433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19520009.

It is not an unprimeable number, because it can be changed into a prime (19520003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50909 + ... + 51290.

It is an arithmetic number, because the mean of its divisors is an integer number (4905600).

Almost surely, 2^19520009 is an apocalyptic number.

It is an amenable number.

19520009 is a deficient number, since it is larger than the sum of its proper divisors (102391).

19520009 is a wasteful number, since it uses less digits than its factorization.

19520009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102390.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 19520009 is about 4418.1454254019. The cubic root of 19520009 is about 269.2526612716.

The spelling of 19520009 in words is "nineteen million, five hundred twenty thousand, nine".