20555322329 has 2 divisors, whose sum is σ = 20555322330. Its totient is φ = 20555322328.

The previous prime is 20555322289. The next prime is 20555322371. The reversal of 20555322329 is 92322355502.

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., 16596395929 + 3958926400 = 128827^2 + 62920^2 .

It is a cyclic number.

It is not a de Polignac number, because 20555322329 - 2²⁴ = 20538545113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20555322292 and 20555322301.

It is not a weakly prime, because it can be changed into another prime (20555327329) 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, 10277661164 + 10277661165.

It is an arithmetic number, because the mean of its divisors is an integer number (10277661165).

Almost surely, 2^20555322329 is an apocalyptic number.

It is an amenable number.

20555322329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20555322329 is an equidigital number, since it uses as much as digits as its factorization.

20555322329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 38.

The spelling of 20555322329 in words is "twenty billion, five hundred fifty-five million, three hundred twenty-two thousand, three hundred twenty-nine".