20534555543502 has 256 divisors, whose sum is σ = 55935096569856. Its totient is φ = 4852576512000.

The previous prime is 20534555543477. The next prime is 20534555543627.

It is a happy number.

20534555543502 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×20534555543502² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 2258773977 + ... + 2258783067.

It is an arithmetic number, because the mean of its divisors is an integer number (218496470976).

Almost surely, 2^{20534555543502} is an apocalyptic number.

20534555543502 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20534555543502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27967548284928).

20534555543502 is an abundant number, since it is smaller than the sum of its proper divisors (35400541026354).

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

20534555543502 is a wasteful number, since it uses less digits than its factorization.

20534555543502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14495.

The product of its (nonzero) digits is 9000000, while the sum is 48.

It can be divided in two parts, 2053455 and 5543502, that added together give a palindrome (7596957).

The spelling of 20534555543502 in words is "twenty trillion, five hundred thirty-four billion, five hundred fifty-five million, five hundred forty-three thousand, five hundred two".