20501144089 has 2 divisors, whose sum is σ = 20501144090. Its totient is φ = 20501144088.

The previous prime is 20501144071. The next prime is 20501144137. The reversal of 20501144089 is 98044110502.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15500250000 + 5000894089 = 124500^2 + 70717^2 .

It is a cyclic number.

It is not a de Polignac number, because 20501144089 - 2⁵ = 20501144057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20501144189) 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, 10250572044 + 10250572045.

It is an arithmetic number, because the mean of its divisors is an integer number (10250572045).

Almost surely, 2^20501144089 is an apocalyptic number.

It is an amenable number.

20501144089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20501144089 is an equidigital number, since it uses as much as digits as its factorization.

20501144089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 20501144089 in words is "twenty billion, five hundred one million, one hundred forty-four thousand, eighty-nine".