20853594545345 has 4 divisors (see below), whose sum is σ = 25024313454420. Its totient is φ = 16682875636272.

The previous prime is 20853594545317. The next prime is 20853594545359. The reversal of 20853594545345 is 54354549535802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5800963773361 + 15052630771984 = 2408519^2 + 3879772^2 .

It is a cyclic number.

It is not a de Polignac number, because 20853594545345 - 2⁶ = 20853594545281 is a prime.

It is a super-2 number, since 2×20853594545345² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2085359454530 + ... + 2085359454539.

It is an arithmetic number, because the mean of its divisors is an integer number (6256078363605).

Almost surely, 2^{20853594545345} is an apocalyptic number.

It is an amenable number.

20853594545345 is a deficient number, since it is larger than the sum of its proper divisors (4170718909075).

20853594545345 is an equidigital number, since it uses as much as digits as its factorization.

20853594545345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4170718909074.

The product of its (nonzero) digits is 259200000, while the sum is 62.

The spelling of 20853594545345 in words is "twenty trillion, eight hundred fifty-three billion, five hundred ninety-four million, five hundred forty-five thousand, three hundred forty-five".