20855114569 has 3 divisors (see below), whose sum is σ = 20855258983. Its totient is φ = 20854970156.

The previous prime is 20855114537. The next prime is 20855114593. The reversal of 20855114569 is 96541155802.

The square root of 20855114569 is 144413.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 744471225 + 20110643344 = 27285^2 + 141812^2 .

It is not a de Polignac number, because 20855114569 - 2⁵ = 20855114537 is a prime.

It is a super-2 number, since 2×20855114569² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20855112569) 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 2 ways as a sum of consecutive naturals, for example, 72207 + ... + 216619.

Almost surely, 2^20855114569 is an apocalyptic number.

20855114569 is the 144413-rd square number.

20855114569 is the 72207-th centered octagonal number.

It is an amenable number.

20855114569 is a deficient number, since it is larger than the sum of its proper divisors (144414).

20855114569 is an frugal number, since it uses more digits than its factorization.

20855114569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288826 (or 144413 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 46.

It can be divided in two parts, 20855 and 114569, that added together give a square (135424 = 368²).

The spelling of 20855114569 in words is "twenty billion, eight hundred fifty-five million, one hundred fourteen thousand, five hundred sixty-nine".