20442464729 has 2 divisors, whose sum is σ = 20442464730. Its totient is φ = 20442464728.

The previous prime is 20442464683. The next prime is 20442464737. The reversal of 20442464729 is 92746424402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20380417600 + 62047129 = 142760^2 + 7877^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442464729 - 2⁸ = 20442464473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20442464729.

It is not a weakly prime, because it can be changed into another prime (20442461729) 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, 10221232364 + 10221232365.

It is an arithmetic number, because the mean of its divisors is an integer number (10221232365).

Almost surely, 2^20442464729 is an apocalyptic number.

It is an amenable number.

20442464729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442464729 is an equidigital number, since it uses as much as digits as its factorization.

20442464729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 44.

The spelling of 20442464729 in words is "twenty billion, four hundred forty-two million, four hundred sixty-four thousand, seven hundred twenty-nine".