17720547317 has 16 divisors (see below), whose sum is σ = 20182487040. Its totient is φ = 15401166000.

The previous prime is 17720547289. The next prime is 17720547323. The reversal of 17720547317 is 71374502771.

It is not a de Polignac number, because 17720547317 - 2⁶ = 17720547253 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 (17720547337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498692 + ... + 533042.

It is an arithmetic number, because the mean of its divisors is an integer number (1261405440).

Almost surely, 2^17720547317 is an apocalyptic number.

It is an amenable number.

17720547317 is a deficient number, since it is larger than the sum of its proper divisors (2461939723).

17720547317 is a wasteful number, since it uses less digits than its factorization.

17720547317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36424.

The product of its (nonzero) digits is 288120, while the sum is 44.

The spelling of 17720547317 in words is "seventeen billion, seven hundred twenty million, five hundred forty-seven thousand, three hundred seventeen".