20718885560 has 64 divisors (see below), whose sum is σ = 48041834400. Its totient is φ = 8035877376.

The previous prime is 20718885503. The next prime is 20718885637. The reversal of 20718885560 is 6558881702.

It is a junction number, because it is equal to n+sod(n) for n = 20718885499 and 20718885508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409751 + ... + 457529.

Almost surely, 2^20718885560 is an apocalyptic number.

20718885560 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 20718885560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24020917200).

20718885560 is an abundant number, since it is smaller than the sum of its proper divisors (27322948840).

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

20718885560 is a wasteful number, since it uses less digits than its factorization.

20718885560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48120 (or 48116 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 50.

The spelling of 20718885560 in words is "twenty billion, seven hundred eighteen million, eight hundred eighty-five thousand, five hundred sixty".