20999310720 has 384 divisors, whose sum is σ = 72925920000. Its totient is φ = 5125386240.

The previous prime is 20999310653. The next prime is 20999310749. The reversal of 20999310720 is 2701399902.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (384).

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 47 ways as a sum of consecutive naturals, for example, 35056981 + ... + 35057579.

It is an arithmetic number, because the mean of its divisors is an integer number (189911250).

Almost surely, 2^20999310720 is an apocalyptic number.

20999310720 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 20999310720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36462960000).

20999310720 is an abundant number, since it is smaller than the sum of its proper divisors (51926609280).

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

20999310720 is a wasteful number, since it uses less digits than its factorization.

20999310720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 42.

The spelling of 20999310720 in words is "twenty billion, nine hundred ninety-nine million, three hundred ten thousand, seven hundred twenty".