20853250338257 has 4 divisors (see below), whose sum is σ = 21104494318320. Its totient is φ = 20602006358196.

The previous prime is 20853250338229. The next prime is 20853250338287. The reversal of 20853250338257 is 75283305235802.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 20853250338257 - 2²⁶ = 20853183229393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20853250338199 and 20853250338208.

It is not an unprimeable number, because it can be changed into a prime (20853250338287) by changing a digit.

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, 125621989907 + ... + 125621990072.

It is an arithmetic number, because the mean of its divisors is an integer number (5276123579580).

Almost surely, 2^{20853250338257} is an apocalyptic number.

It is an amenable number.

20853250338257 is a deficient number, since it is larger than the sum of its proper divisors (251243980063).

20853250338257 is an equidigital number, since it uses as much as digits as its factorization.

20853250338257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251243980062.

The product of its (nonzero) digits is 12096000, while the sum is 53.

The spelling of 20853250338257 in words is "twenty trillion, eight hundred fifty-three billion, two hundred fifty million, three hundred thirty-eight thousand, two hundred fifty-seven".