20730704 has 20 divisors (see below), whose sum is σ = 40375764. Its totient is φ = 10311168.

The previous prime is 20730623. The next prime is 20730719. The reversal of 20730704 is 40703702.

It can be written as a sum of positive squares in 2 ways, for example, as 20430400 + 300304 = 4520^2 + 548^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20730704.

It is a congruent number.

It is an unprimeable number.

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, 137 + ... + 6440.

Almost surely, 2^20730704 is an apocalyptic number.

It is an amenable number.

20730704 is a deficient number, since it is larger than the sum of its proper divisors (19645060).

20730704 is a wasteful number, since it uses less digits than its factorization.

20730704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6782 (or 6776 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 23.

The square root of 20730704 is about 4553.0982857830. The cubic root of 20730704 is about 274.7080273069.

The spelling of 20730704 in words is "twenty million, seven hundred thirty thousand, seven hundred four".