20915947008 has 960 divisors, whose sum is σ = 77215057920. Its totient is φ = 5573836800.

The previous prime is 20915946949. The next prime is 20915947051. The reversal of 20915947008 is 80074951902.

20915947008 is a `hidden beast` number, since 20 + 9 + 159 + 470 + 0 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 674707953 + ... + 674707983.

It is an arithmetic number, because the mean of its divisors is an integer number (80432352).

Almost surely, 2^20915947008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20915947008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38607528960).

20915947008 is an abundant number, since it is smaller than the sum of its proper divisors (56299110912).

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

20915947008 is a wasteful number, since it uses less digits than its factorization.

20915947008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 20915947008 in words is "twenty billion, nine hundred fifteen million, nine hundred forty-seven thousand, eight".