20173685705 has 16 divisors (see below), whose sum is σ = 25003743744. Its totient is φ = 15609335040.

The previous prime is 20173685663. The next prime is 20173685723. The reversal of 20173685705 is 50758637102.

It is a happy number.

It is not a de Polignac number, because 20173685705 - 2¹² = 20173681609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238814 + ... + 312056.

It is an arithmetic number, because the mean of its divisors is an integer number (1562733984).

Almost surely, 2^20173685705 is an apocalyptic number.

It is an amenable number.

20173685705 is a deficient number, since it is larger than the sum of its proper divisors (4830058039).

20173685705 is a wasteful number, since it uses less digits than its factorization.

20173685705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75056.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 20173685705 in words is "twenty billion, one hundred seventy-three million, six hundred eighty-five thousand, seven hundred five".