20045543449 has 2 divisors, whose sum is σ = 20045543450. Its totient is φ = 20045543448.

The previous prime is 20045543411. The next prime is 20045543467. The reversal of 20045543449 is 94434554002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14554733449 + 5490810000 = 120643^2 + 74100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20045543449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20045543549) 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 as a sum of consecutive naturals, namely, 10022771724 + 10022771725.

It is an arithmetic number, because the mean of its divisors is an integer number (10022771725).

Almost surely, 2^20045543449 is an apocalyptic number.

It is an amenable number.

20045543449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045543449 is an equidigital number, since it uses as much as digits as its factorization.

20045543449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 20045543449 in words is "twenty billion, forty-five million, five hundred forty-three thousand, four hundred forty-nine".