20555557011080 has 256 divisors, whose sum is σ = 59067283968000. Its totient is φ = 6264705162240.

The previous prime is 20555557011029. The next prime is 20555557011109. The reversal of 20555557011080 is 8011075555502.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10188071 + ... + 12037769.

It is an arithmetic number, because the mean of its divisors is an integer number (230731578000).

Almost surely, 2^{20555557011080} is an apocalyptic number.

20555557011080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20555557011080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29533641984000).

20555557011080 is an abundant number, since it is smaller than the sum of its proper divisors (38511726956920).

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

20555557011080 is a wasteful number, since it uses less digits than its factorization.

20555557011080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849844 (or 1849840 counting only the distinct ones).

The product of its (nonzero) digits is 350000, while the sum is 44.

The spelling of 20555557011080 in words is "twenty trillion, five hundred fifty-five billion, five hundred fifty-seven million, eleven thousand, eighty".