20045543203540 has 24 divisors (see below), whose sum is σ = 44311200766560. Its totient is φ = 7596205845408.

The previous prime is 20045543203501. The next prime is 20045543203547. The reversal of 20045543203540 is 4530234554002.

It is a self number, because there is not a number n which added to its sum of digits gives 20045543203540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045543203547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26375714362 + ... + 26375715121.

It is an arithmetic number, because the mean of its divisors is an integer number (1846300031940).

Almost surely, 2^{20045543203540} is an apocalyptic number.

20045543203540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20045543203540 is an abundant number, since it is smaller than the sum of its proper divisors (24265657563020).

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

20045543203540 is a wasteful number, since it uses less digits than its factorization.

20045543203540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52751429511 (or 52751429509 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 37.

Adding to 20045543203540 its reverse (4530234554002), we get a palindrome (24575777757542).

The spelling of 20045543203540 in words is "twenty trillion, forty-five billion, five hundred forty-three million, two hundred three thousand, five hundred forty".