20543413540440 has 768 divisors, whose sum is σ = 76251018211200. Its totient is φ = 4406978150400.

The previous prime is 20543413540423. The next prime is 20543413540511. The reversal of 20543413540440 is 4404531434502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1964555692 + ... + 1964566148.

Almost surely, 2^{20543413540440} is an apocalyptic number.

20543413540440 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 20543413540440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38125509105600).

20543413540440 is an abundant number, since it is smaller than the sum of its proper divisors (55707604670760).

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

20543413540440 is a wasteful number, since it uses less digits than its factorization.

20543413540440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10836 (or 10825 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 39.

Adding to 20543413540440 its reverse (4404531434502), we get a palindrome (24947944974942).

The spelling of 20543413540440 in words is "twenty trillion, five hundred forty-three billion, four hundred thirteen million, five hundred forty thousand, four hundred forty".