20730009 has 8 divisors (see below), whose sum is σ = 27669600. Its totient is φ = 13805216.

The previous prime is 20729993. The next prime is 20730011. The reversal of 20730009 is 90003702.

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 20730009 - 2⁴ = 20729993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20730079) 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 7 ways as a sum of consecutive naturals, for example, 142 + ... + 6440.

It is an arithmetic number, because the mean of its divisors is an integer number (3458700).

Almost surely, 2^20730009 is an apocalyptic number.

It is an amenable number.

20730009 is a deficient number, since it is larger than the sum of its proper divisors (6939591).

20730009 is a wasteful number, since it uses less digits than its factorization.

20730009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7399.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 20730009 is about 4553.0219634875. The cubic root of 20730009 is about 274.7049573965.

The spelling of 20730009 in words is "twenty million, seven hundred thirty thousand, nine".