20854358165 has 8 divisors (see below), whose sum is σ = 25026168888. Its totient is φ = 16682860480.

The previous prime is 20854358149. The next prime is 20854358207. The reversal of 20854358165 is 56185345802.

It can be written as a sum of positive squares in 4 ways, for example, as 122389969 + 20731968196 = 11063^2 + 143986^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20854358165 - 2⁴ = 20854358149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 109079 + ... + 231531.

It is an arithmetic number, because the mean of its divisors is an integer number (3128271111).

Almost surely, 2^20854358165 is an apocalyptic number.

It is an amenable number.

20854358165 is a deficient number, since it is larger than the sum of its proper divisors (4171810723).

20854358165 is a wasteful number, since it uses less digits than its factorization.

20854358165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156519.

The product of its (nonzero) digits is 1152000, while the sum is 47.

The spelling of 20854358165 in words is "twenty billion, eight hundred fifty-four million, three hundred fifty-eight thousand, one hundred sixty-five".