20915307168 has 384 divisors, whose sum is σ = 66875719680. Its totient is φ = 5598720000.

The previous prime is 20915307143. The next prime is 20915307223. The reversal of 20915307168 is 86170351902.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 138511893 + ... + 138512043.

It is an arithmetic number, because the mean of its divisors is an integer number (174155520).

Almost surely, 2^20915307168 is an apocalyptic number.

20915307168 is a gapful number since it is divisible by the number (28) 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 20915307168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33437859840).

20915307168 is an abundant number, since it is smaller than the sum of its proper divisors (45960412512).

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

20915307168 is a wasteful number, since it uses less digits than its factorization.

20915307168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 20915307168 in words is "twenty billion, nine hundred fifteen million, three hundred seven thousand, one hundred sixty-eight".