20645646323 has 2 divisors, whose sum is σ = 20645646324. Its totient is φ = 20645646322.

The previous prime is 20645646313. The next prime is 20645646353. The reversal of 20645646323 is 32364654602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20645646323 - 2¹⁰ = 20645645299 is a prime.

It is not a weakly prime, because it can be changed into another prime (20645646313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322823161 + 10322823162.

It is an arithmetic number, because the mean of its divisors is an integer number (10322823162).

Almost surely, 2^20645646323 is an apocalyptic number.

20645646323 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645646323 is an equidigital number, since it uses as much as digits as its factorization.

20645646323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 20645646323 in words is "twenty billion, six hundred forty-five million, six hundred forty-six thousand, three hundred twenty-three".