20445360554251 has 4 divisors (see below), whose sum is σ = 20447425543504. Its totient is φ = 20443295565000.

The previous prime is 20445360554237. The next prime is 20445360554257. The reversal of 20445360554251 is 15245506354402.

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

It is a cyclic number.

It is not a de Polignac number, because 20445360554251 - 2¹³ = 20445360546059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445360554257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1032479775 + ... + 1032499576.

It is an arithmetic number, because the mean of its divisors is an integer number (5111856385876).

Almost surely, 2^{20445360554251} is an apocalyptic number.

20445360554251 is a deficient number, since it is larger than the sum of its proper divisors (2064989253).

20445360554251 is an equidigital number, since it uses as much as digits as its factorization.

20445360554251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064989252.

The product of its (nonzero) digits is 2880000, while the sum is 46.

The spelling of 20445360554251 in words is "twenty trillion, four hundred forty-five billion, three hundred sixty million, five hundred fifty-four thousand, two hundred fifty-one".