20505544240053 has 16 divisors (see below), whose sum is σ = 29049173216640. Its totient is φ = 12866223827648.

The previous prime is 20505544240039. The next prime is 20505544240079. The reversal of 20505544240053 is 35004244550502.

It is not a de Polignac number, because 20505544240053 - 2⁴ = 20505544240037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20505544239993 and 20505544240020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20505544241053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 695607225 + ... + 695636702.

It is an arithmetic number, because the mean of its divisors is an integer number (1815573326040).

Almost surely, 2^{20505544240053} is an apocalyptic number.

It is an amenable number.

20505544240053 is a deficient number, since it is larger than the sum of its proper divisors (8543628976587).

20505544240053 is an equidigital number, since it uses as much as digits as its factorization.

20505544240053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391243981 (or 1391243947 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 39.

Adding to 20505544240053 its reverse (35004244550502), we get a palindrome (55509788790555).

The spelling of 20505544240053 in words is "twenty trillion, five hundred five billion, five hundred forty-four million, two hundred forty thousand, fifty-three".