20555557011081 has 24 divisors (see below), whose sum is σ = 30986873438976. Its totient is φ = 13105951784640.

The previous prime is 20555557011029. The next prime is 20555557011109. The reversal of 20555557011081 is 18011075555502.

20555557011081 is a `hidden beast` number, since 2 + 0 + 5 + 5 + 5 + 557 + 0 + 1 + 10 + 81 = 666.

It is not a de Polignac number, because 20555557011081 - 2¹¹ = 20555557009033 is a prime.

It is a super-3 number, since 3×20555557011081³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20555557011481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5944225 + ... + 8743278.

It is an arithmetic number, because the mean of its divisors is an integer number (1291119726624).

Almost surely, 2^{20555557011081} is an apocalyptic number.

It is an amenable number.

20555557011081 is a deficient number, since it is larger than the sum of its proper divisors (10431316427895).

20555557011081 is a wasteful number, since it uses less digits than its factorization.

20555557011081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14694293 (or 14694290 counting only the distinct ones).

The product of its (nonzero) digits is 350000, while the sum is 45.

The spelling of 20555557011081 in words is "twenty trillion, five hundred fifty-five billion, five hundred fifty-seven million, eleven thousand, eighty-one".