20909992320 has 256 divisors, whose sum is σ = 84636172800. Its totient is φ = 4779399168.

The previous prime is 20909992303. The next prime is 20909992339. The reversal of 20909992320 is 2329990902.

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 polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34527 + ... + 207393.

It is an arithmetic number, because the mean of its divisors is an integer number (330610050).

Almost surely, 2^20909992320 is an apocalyptic number.

20909992320 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 20909992320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42318086400).

20909992320 is an abundant number, since it is smaller than the sum of its proper divisors (63726180480).

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

20909992320 is a wasteful number, since it uses less digits than its factorization.

20909992320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172902 (or 172884 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The spelling of 20909992320 in words is "twenty billion, nine hundred nine million, nine hundred ninety-two thousand, three hundred twenty".