20989018080 has 168 divisors, whose sum is σ = 74346235992. Its totient is φ = 5597040384.

The previous prime is 20989018079. The next prime is 20989018121. The reversal of 20989018080 is 8081098902.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 26667 + ... + 206613.

It is an arithmetic number, because the mean of its divisors is an integer number (442537119).

Almost surely, 2^20989018080 is an apocalyptic number.

20989018080 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 20989018080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37173117996).

20989018080 is an abundant number, since it is smaller than the sum of its proper divisors (53357217912).

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

20989018080 is an equidigital number, since it uses as much as digits as its factorization.

20989018080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179980 (or 179957 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The spelling of 20989018080 in words is "twenty billion, nine hundred eighty-nine million, eighteen thousand, eighty".