20266551002645 has 4 divisors (see below), whose sum is σ = 24319861203180. Its totient is φ = 16213240802112.

The previous prime is 20266551002639. The next prime is 20266551002699. The reversal of 20266551002645 is 54620015566202.

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 9600931540369 + 10665619462276 = 3098537^2 + 3265826^2 .

It is a cyclic number.

It is not a de Polignac number, because 20266551002645 - 2⁴⁰ = 19167039374869 is a prime.

It is a super-2 number, since 2×20266551002645² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20266551002596 and 20266551002605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026655100260 + ... + 2026655100269.

It is an arithmetic number, because the mean of its divisors is an integer number (6079965300795).

Almost surely, 2^{20266551002645} is an apocalyptic number.

It is an amenable number.

20266551002645 is a deficient number, since it is larger than the sum of its proper divisors (4053310200535).

20266551002645 is an equidigital number, since it uses as much as digits as its factorization.

20266551002645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4053310200534.

The product of its (nonzero) digits is 864000, while the sum is 44.

Adding to 20266551002645 its reverse (54620015566202), we get a palindrome (74886566568847).

The spelling of 20266551002645 in words is "twenty trillion, two hundred sixty-six billion, five hundred fifty-one million, two thousand, six hundred forty-five".