20989800000 has 1008 divisors, whose sum is σ = 87148172160. Its totient is φ = 4942080000.

The previous prime is 20989799993. The next prime is 20989800017. The reversal of 20989800000 is 898902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 912599989 + ... + 912600011.

It is an arithmetic number, because the mean of its divisors is an integer number (86456520).

Almost surely, 2^20989800000 is an apocalyptic number.

20989800000 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 20989800000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43574086080).

20989800000 is an abundant number, since it is smaller than the sum of its proper divisors (66158372160).

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

20989800000 is an equidigital number, since it uses as much as digits as its factorization.

20989800000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 20989800000 in words is "twenty billion, nine hundred eighty-nine million, eight hundred thousand".