20561012322 has 64 divisors (see below), whose sum is σ = 42746216448. Its totient is φ = 6586272000.

The previous prime is 20561012261. The next prime is 20561012347. The reversal of 20561012322 is 22321016502.

It is a junction number, because it is equal to n+sod(n) for n = 20561012292 and 20561012301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20747247 + ... + 20748237.

It is an arithmetic number, because the mean of its divisors is an integer number (667909632).

Almost surely, 2^20561012322 is an apocalyptic number.

20561012322 is an abundant number, since it is smaller than the sum of its proper divisors (22185204126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20561012322 is a wasteful number, since it uses less digits than its factorization.

20561012322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20561012322 its reverse (22321016502), we get a palindrome (42882028824).

The spelling of 20561012322 in words is "twenty billion, five hundred sixty-one million, twelve thousand, three hundred twenty-two".