20644345323 has 48 divisors (see below), whose sum is σ = 35480376256. Its totient is φ = 11320611840.

The previous prime is 20644345277. The next prime is 20644345327. The reversal of 20644345323 is 32354344602.

20644345323 is a `hidden beast` number, since 2 + 0 + 644 + 3 + 4 + 5 + 3 + 2 + 3 = 666.

It is not a de Polignac number, because 20644345323 - 2⁶ = 20644345259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20644345327) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109503 + ... + 230823.

Almost surely, 2^20644345323 is an apocalyptic number.

20644345323 is a deficient number, since it is larger than the sum of its proper divisors (14836030933).

20644345323 is a wasteful number, since it uses less digits than its factorization.

20644345323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121444 (or 121441 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 36.

Adding to 20644345323 its reverse (32354344602), we get a palindrome (52998689925).

The spelling of 20644345323 in words is "twenty billion, six hundred forty-four million, three hundred forty-five thousand, three hundred twenty-three".