20730317 has 4 divisors (see below), whose sum is σ = 20751456. Its totient is φ = 20709180.

The previous prime is 20730313. The next prime is 20730373. The reversal of 20730317 is 71303702.

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: 71303702 = 2 ⋅35651851.

It is a cyclic number.

It is not a de Polignac number, because 20730317 - 2² = 20730313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20730292 and 20730301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9023 + ... + 11084.

It is an arithmetic number, because the mean of its divisors is an integer number (5187864).

Almost surely, 2^20730317 is an apocalyptic number.

It is an amenable number.

20730317 is a deficient number, since it is larger than the sum of its proper divisors (21139).

20730317 is a wasteful number, since it uses less digits than its factorization.

20730317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21138.

The product of its (nonzero) digits is 882, while the sum is 23.

The square root of 20730317 is about 4553.0557870512. The cubic root of 20730317 is about 274.7063178832.

The spelling of 20730317 in words is "twenty million, seven hundred thirty thousand, three hundred seventeen".