20559709317 has 16 divisors (see below), whose sum is σ = 31331294720. Its totient is φ = 11747575152.

The previous prime is 20559709301. The next prime is 20559709319. The reversal of 20559709317 is 71390795502.

It is not a de Polignac number, because 20559709317 - 2⁴ = 20559709301 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 (20559709319) 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, 392034 + ... + 441372.

It is an arithmetic number, because the mean of its divisors is an integer number (1958205920).

Almost surely, 2^20559709317 is an apocalyptic number.

It is an amenable number.

20559709317 is a deficient number, since it is larger than the sum of its proper divisors (10771585403).

20559709317 is a wasteful number, since it uses less digits than its factorization.

20559709317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69192.

The product of its (nonzero) digits is 595350, while the sum is 48.

The spelling of 20559709317 in words is "twenty billion, five hundred fifty-nine million, seven hundred nine thousand, three hundred seventeen".