20322536561 has 4 divisors (see below), whose sum is σ = 20468742000. Its totient is φ = 20176331124.

The previous prime is 20322536551. The next prime is 20322536579. The reversal of 20322536561 is 16563522302.

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 20322536561 - 2⁶ = 20322536497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20322536551) 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, 73102511 + ... + 73102788.

It is an arithmetic number, because the mean of its divisors is an integer number (5117185500).

Almost surely, 2^20322536561 is an apocalyptic number.

It is an amenable number.

20322536561 is a deficient number, since it is larger than the sum of its proper divisors (146205439).

20322536561 is a wasteful number, since it uses less digits than its factorization.

20322536561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146205438.

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 20322536561 in words is "twenty billion, three hundred twenty-two million, five hundred thirty-six thousand, five hundred sixty-one".