20320312289 has 2 divisors, whose sum is σ = 20320312290. Its totient is φ = 20320312288.

The previous prime is 20320312231. The next prime is 20320312301. The reversal of 20320312289 is 98221302302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10523271889 + 9797040400 = 102583^2 + 98980^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320312289 - 2²⁸ = 20051876833 is a prime.

It is not a weakly prime, because it can be changed into another prime (20320318289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160156144 + 10160156145.

It is an arithmetic number, because the mean of its divisors is an integer number (10160156145).

Almost surely, 2^20320312289 is an apocalyptic number.

It is an amenable number.

20320312289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320312289 is an equidigital number, since it uses as much as digits as its factorization.

20320312289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 20320312289 in words is "twenty billion, three hundred twenty million, three hundred twelve thousand, two hundred eighty-nine".