20643819356160 has 4896 divisors, whose sum is σ = 104166238280832. Its totient is φ = 3852635996160.

The previous prime is 20643819356137. The next prime is 20643819356179. The reversal of 20643819356160 is 6165391834602.

20643819356160 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 3 + 8 + 19 + 3 + 5 + 616 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 20643819356097 and 20643819356106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 557941063662 + ... + 557941063698.

Almost surely, 2^{20643819356160} is an apocalyptic number.

20643819356160 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 20643819356160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52083119140416).

20643819356160 is an abundant number, since it is smaller than the sum of its proper divisors (83522418924672).

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

20643819356160 is an equidigital number, since it uses as much as digits as its factorization.

20643819356160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 20643819356160 in words is "twenty trillion, six hundred forty-three billion, eight hundred nineteen million, three hundred fifty-six thousand, one hundred sixty".