20354643604542 has 128 divisors (see below), whose sum is σ = 47281745710080. Its totient is φ = 5787642240000.

The previous prime is 20354643604531. The next prime is 20354643604549. The reversal of 20354643604542 is 24540634645302.

It is a junction number, because it is equal to n+sod(n) for n = 20354643604491 and 20354643604500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20354643604549) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 407141167 + ... + 407191157.

It is an arithmetic number, because the mean of its divisors is an integer number (369388638360).

Almost surely, 2^{20354643604542} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20354643604542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23640872855040).

20354643604542 is an abundant number, since it is smaller than the sum of its proper divisors (26927102105538).

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

20354643604542 is a wasteful number, since it uses less digits than its factorization.

20354643604542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56770.

The product of its (nonzero) digits is 8294400, while the sum is 48.

The spelling of 20354643604542 in words is "twenty trillion, three hundred fifty-four billion, six hundred forty-three million, six hundred four thousand, five hundred forty-two".