20659800000 has 336 divisors, whose sum is σ = 78100001280. Its totient is φ = 4721280000.

The previous prime is 20659799987. The next prime is 20659800017. The reversal of 20659800000 is 895602.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4197541 + ... + 4202459.

It is an arithmetic number, because the mean of its divisors is an integer number (232440480).

Almost surely, 2^20659800000 is an apocalyptic number.

20659800000 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 20659800000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39050000640).

20659800000 is an abundant number, since it is smaller than the sum of its proper divisors (57440201280).

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

20659800000 is an frugal number, since it uses more digits than its factorization.

20659800000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4966 (or 4936 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 20659800000 in words is "twenty billion, six hundred fifty-nine million, eight hundred thousand".