20858734317 has 4 divisors (see below), whose sum is σ = 27811645760. Its totient is φ = 13905822876.

The previous prime is 20858734301. The next prime is 20858734319. The reversal of 20858734317 is 71343785802.

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.

It is not a de Polignac number, because 20858734317 - 2⁴ = 20858734301 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 (20858734319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476455717 + ... + 3476455722.

It is an arithmetic number, because the mean of its divisors is an integer number (6952911440).

Almost surely, 2^20858734317 is an apocalyptic number.

It is an amenable number.

20858734317 is a deficient number, since it is larger than the sum of its proper divisors (6952911443).

20858734317 is an equidigital number, since it uses as much as digits as its factorization.

20858734317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6952911442.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 20858734317 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-four thousand, three hundred seventeen".