20998357159680 has 180 divisors, whose sum is σ = 75135962265672. Its totient is φ = 5599561881600.

The previous prime is 20998357159669. The next prime is 20998357159693. The reversal of 20998357159680 is 8695175389902.

20998357159680 is a `hidden beast` number, since 20 + 9 + 9 + 8 + 3 + 5 + 7 + 1 + 596 + 8 + 0 = 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 junction number, because it is equal to n+sod(n) for n = 20998357159599 and 20998357159608.

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, 101161546 + ... + 101368905.

Almost surely, 2^{20998357159680} is an apocalyptic number.

20998357159680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20998357159680 is an abundant number, since it is smaller than the sum of its proper divisors (54137605105992).

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

20998357159680 is an equidigital number, since it uses as much as digits as its factorization.

20998357159680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202530484 (or 202530461 counting only the distinct ones).

The product of its (nonzero) digits is 293932800, while the sum is 72.

The spelling of 20998357159680 in words is "twenty trillion, nine hundred ninety-eight billion, three hundred fifty-seven million, one hundred fifty-nine thousand, six hundred eighty".