20892321644544 has 408 divisors, whose sum is σ = 69045686236800. Its totient is φ = 5963318820864.

The previous prime is 20892321644533. The next prime is 20892321644569. The reversal of 20892321644544 is 44544612329802.

20892321644544 is a `hidden beast` number, since 2 + 0 + 8 + 9 + 2 + 32 + 1 + 64 + 4 + 544 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5776144624 + ... + 5776148240.

Almost surely, 2^{20892321644544} is an apocalyptic number.

20892321644544 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 20892321644544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34522843118400).

20892321644544 is an abundant number, since it is smaller than the sum of its proper divisors (48153364592256).

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

20892321644544 is an equidigital number, since it uses as much as digits as its factorization.

20892321644544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5061 (or 5028 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 54.

The spelling of 20892321644544 in words is "twenty trillion, eight hundred ninety-two billion, three hundred twenty-one million, six hundred forty-four thousand, five hundred forty-four".