20501866813464 has 192 divisors, whose sum is σ = 57626686016640. Its totient is φ = 6579594178560.

The previous prime is 20501866813403. The next prime is 20501866813481. The reversal of 20501866813464 is 46431866810502.

20501866813464 is a `hidden beast` number, since 2 + 0 + 501 + 8 + 6 + 68 + 13 + 4 + 64 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 20501866813464.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 114145249 + ... + 114324719.

It is an arithmetic number, because the mean of its divisors is an integer number (300138989670).

Almost surely, 2^{20501866813464} is an apocalyptic number.

20501866813464 is a gapful number since it is divisible by the number (24) 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 20501866813464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28813343008320).

20501866813464 is an abundant number, since it is smaller than the sum of its proper divisors (37124819203176).

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

20501866813464 is a wasteful number, since it uses less digits than its factorization.

20501866813464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179970 (or 179963 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 20501866813464 in words is "twenty trillion, five hundred one billion, eight hundred sixty-six million, eight hundred thirteen thousand, four hundred sixty-four".