20561150558 has 24 divisors (see below), whose sum is σ = 33295844568. Its totient is φ = 9466459488.

The previous prime is 20561150549. The next prime is 20561150569. The reversal of 20561150558 is 85505116502.

It is a super-3 number, since 3×20561150558³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18539708 + ... + 18540816.

It is an arithmetic number, because the mean of its divisors is an integer number (1387326857).

Almost surely, 2^20561150558 is an apocalyptic number.

20561150558 is a deficient number, since it is larger than the sum of its proper divisors (12734694010).

20561150558 is an equidigital number, since it uses as much as digits as its factorization.

20561150558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 38.

The spelling of 20561150558 in words is "twenty billion, five hundred sixty-one million, one hundred fifty thousand, five hundred fifty-eight".