20445364393 has 4 divisors (see below), whose sum is σ = 20447126980. Its totient is φ = 20443601808.

The previous prime is 20445364351. The next prime is 20445364397. The reversal of 20445364393 is 39346354402.

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 7640857744 + 12804506649 = 87412^2 + 113157^2 .

It is a cyclic number.

It is not a de Polignac number, because 20445364393 - 2¹⁷ = 20445233321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20445364397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 863778 + ... + 887131.

It is an arithmetic number, because the mean of its divisors is an integer number (5111781745).

Almost surely, 2^20445364393 is an apocalyptic number.

It is an amenable number.

20445364393 is a deficient number, since it is larger than the sum of its proper divisors (1762587).

20445364393 is a wasteful number, since it uses less digits than its factorization.

20445364393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762586.

The product of its (nonzero) digits is 933120, while the sum is 43.

The spelling of 20445364393 in words is "twenty billion, four hundred forty-five million, three hundred sixty-four thousand, three hundred ninety-three".