20345673329 has 2 divisors, whose sum is σ = 20345673330. Its totient is φ = 20345673328.

The previous prime is 20345673317. The next prime is 20345673343. The reversal of 20345673329 is 92337654302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20328200929 + 17472400 = 142577^2 + 4180^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345673329 - 2³² = 16050706033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20345673329.

It is not a weakly prime, because it can be changed into another prime (20345672329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172836664 + 10172836665.

It is an arithmetic number, because the mean of its divisors is an integer number (10172836665).

Almost surely, 2^20345673329 is an apocalyptic number.

It is an amenable number.

20345673329 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345673329 is an equidigital number, since it uses as much as digits as its factorization.

20345673329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 44.

The spelling of 20345673329 in words is "twenty billion, three hundred forty-five million, six hundred seventy-three thousand, three hundred twenty-nine".