20915404922880 has 1344 divisors, whose sum is σ = 83275470532800. Its totient is φ = 4810245931008.

The previous prime is 20915404922849. The next prime is 20915404922917. The reversal of 20915404922880 is 8822940451902.

20915404922880 is a `hidden beast` number, since 2 + 0 + 9 + 1 + 5 + 404 + 9 + 228 + 8 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12138945699 + ... + 12138947421.

It is an arithmetic number, because the mean of its divisors is an integer number (61960915575).

Almost surely, 2^{20915404922880} is an apocalyptic number.

20915404922880 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 20915404922880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41637735266400).

20915404922880 is an abundant number, since it is smaller than the sum of its proper divisors (62360065609920).

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

20915404922880 is a wasteful number, since it uses less digits than its factorization.

20915404922880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939 (or 1912 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 20915404922880 in words is "twenty trillion, nine hundred fifteen billion, four hundred four million, nine hundred twenty-two thousand, eight hundred eighty".