20730717 has 12 divisors (see below), whose sum is σ = 34222240. Its totient is φ = 11846088.

The previous prime is 20730623. The next prime is 20730719. The reversal of 20730717 is 71703702.

It is a de Polignac number, because none of the positive numbers 2^k-20730717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164467 + ... + 164592.

Almost surely, 2^20730717 is an apocalyptic number.

It is an amenable number.

20730717 is a deficient number, since it is larger than the sum of its proper divisors (13491523).

20730717 is a wasteful number, since it uses less digits than its factorization.

20730717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329072 (or 329069 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 27.

The square root of 20730717 is about 4553.0997133821. The cubic root of 20730717 is about 274.7080847290.

The spelling of 20730717 in words is "twenty million, seven hundred thirty thousand, seven hundred seventeen".