20045435549 has 2 divisors, whose sum is σ = 20045435550. Its totient is φ = 20045435548.

The previous prime is 20045435513. The next prime is 20045435551. The reversal of 20045435549 is 94553454002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16814308900 + 3231126649 = 129670^2 + 56843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20045435549 is a prime.

It is a super-2 number, since 2×20045435549² (a number of 21 digits) contains 22 as substring.

Together with 20045435551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20045435569) 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, 10022717774 + 10022717775.

It is an arithmetic number, because the mean of its divisors is an integer number (10022717775).

Almost surely, 2^20045435549 is an apocalyptic number.

It is an amenable number.

20045435549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045435549 is an equidigital number, since it uses as much as digits as its factorization.

20045435549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 20045435549 in words is "twenty billion, forty-five million, four hundred thirty-five thousand, five hundred forty-nine".