20645563323 has 48 divisors (see below), whose sum is σ = 35293152384. Its totient is φ = 10614320640.

The previous prime is 20645563319. The next prime is 20645563327. The reversal of 20645563323 is 32336554602.

It is an interprime number because it is at equal distance from previous prime (20645563319) and next prime (20645563327).

It is not a de Polignac number, because 20645563323 - 2² = 20645563319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20645563327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91036 + ... + 222662.

It is an arithmetic number, because the mean of its divisors is an integer number (735274008).

Almost surely, 2^20645563323 is an apocalyptic number.

20645563323 is a deficient number, since it is larger than the sum of its proper divisors (14647589061).

20645563323 is a wasteful number, since it uses less digits than its factorization.

20645563323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131752 (or 131745 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 39.

The spelling of 20645563323 in words is "twenty billion, six hundred forty-five million, five hundred sixty-three thousand, three hundred twenty-three".