20643122329 has 4 divisors (see below), whose sum is σ = 20685165840. Its totient is φ = 20601078820.

The previous prime is 20643122323. The next prime is 20643122351. The reversal of 20643122329 is 92322134602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20643122329 - 2¹³ = 20643114137 is a prime.

It is a super-2 number, since 2×20643122329² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20643122294 and 20643122303.

It is not an unprimeable number, because it can be changed into a prime (20643122323) 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 in 3 ways as a sum of consecutive naturals, for example, 21021019 + ... + 21022000.

It is an arithmetic number, because the mean of its divisors is an integer number (5171291460).

Almost surely, 2^20643122329 is an apocalyptic number.

It is an amenable number.

20643122329 is a deficient number, since it is larger than the sum of its proper divisors (42043511).

20643122329 is an equidigital number, since it uses as much as digits as its factorization.

20643122329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42043510.

The product of its (nonzero) digits is 31104, while the sum is 34.

The spelling of 20643122329 in words is "twenty billion, six hundred forty-three million, one hundred twenty-two thousand, three hundred twenty-nine".