20993991816960 has 180 divisors, whose sum is σ = 75120342271128. Its totient is φ = 5598397790208.

The previous prime is 20993991816947. The next prime is 20993991816977. The reversal of 20993991816960 is 6961819939902.

It is a happy number.

20993991816960 is a `hidden beast` number, since 2 + 0 + 9 + 9 + 399 + 18 + 169 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 101140494 + ... + 101347853.

Almost surely, 2^{20993991816960} is an apocalyptic number.

20993991816960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20993991816960 is an abundant number, since it is smaller than the sum of its proper divisors (54126350454168).

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

20993991816960 is an equidigital number, since it uses as much as digits as its factorization.

20993991816960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202488380 (or 202488357 counting only the distinct ones).

The product of its (nonzero) digits is 102036672, while the sum is 72.

The spelling of 20993991816960 in words is "twenty trillion, nine hundred ninety-three billion, nine hundred ninety-one million, eight hundred sixteen thousand, nine hundred sixty".