20561255122 has 8 divisors (see below), whose sum is σ = 32182834176. Its totient is φ = 9833643732.

The previous prime is 20561255087. The next prime is 20561255123. The reversal of 20561255122 is 22155216502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20561255123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223491858 + ... + 223491949.

It is an arithmetic number, because the mean of its divisors is an integer number (4022854272).

Almost surely, 2^20561255122 is an apocalyptic number.

20561255122 is a deficient number, since it is larger than the sum of its proper divisors (11621579054).

20561255122 is a wasteful number, since it uses less digits than its factorization.

20561255122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446983832.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 20561255122 in words is "twenty billion, five hundred sixty-one million, two hundred fifty-five thousand, one hundred twenty-two".