20683998720 has 960 divisors, whose sum is σ = 91003461120. Its totient is φ = 4217241600.

The previous prime is 20683998707. The next prime is 20683998743. The reversal of 20683998720 is 2789938602.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (960).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 157893055 + ... + 157893185.

It is an arithmetic number, because the mean of its divisors is an integer number (94795272).

Almost surely, 2^20683998720 is an apocalyptic number.

20683998720 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 20683998720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45501730560).

20683998720 is an abundant number, since it is smaller than the sum of its proper divisors (70319462400).

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

20683998720 is a wasteful number, since it uses less digits than its factorization.

20683998720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 20683998720 in words is "twenty billion, six hundred eighty-three million, nine hundred ninety-eight thousand, seven hundred twenty".