19700009 has 12 divisors (see below), whose sum is σ = 23003604. Its totient is φ = 16821504.

The previous prime is 19699997. The next prime is 19700027. The reversal of 19700009 is 90000791.

It can be written as a sum of positive squares in 2 ways, for example, as 7645225 + 12054784 = 2765^2 + 3472^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19700009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19700069) 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 11 ways as a sum of consecutive naturals, for example, 15917 + ... + 17109.

It is an arithmetic number, because the mean of its divisors is an integer number (1916967).

Almost surely, 2^19700009 is an apocalyptic number.

It is an amenable number.

19700009 is a deficient number, since it is larger than the sum of its proper divisors (3303595).

19700009 is a wasteful number, since it uses less digits than its factorization.

19700009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544 (or 1537 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 19700009 is about 4438.4692180976. The cubic root of 19700009 is about 270.0777508136.

The spelling of 19700009 in words is "nineteen million, seven hundred thousand, nine".