20452123253543 has 4 divisors (see below), whose sum is σ = 20452528192368. Its totient is φ = 20451718314720.

The previous prime is 20452123253509. The next prime is 20452123253567. The reversal of 20452123253543 is 34535232125402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20452123253543 - 2¹² = 20452123249447 is a prime.

It is a super-2 number, since 2×20452123253543² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20452123253543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20452123253143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202393643 + ... + 202494668.

It is an arithmetic number, because the mean of its divisors is an integer number (5113132048092).

Almost surely, 2^{20452123253543} is an apocalyptic number.

20452123253543 is a deficient number, since it is larger than the sum of its proper divisors (404938825).

20452123253543 is an equidigital number, since it uses as much as digits as its factorization.

20452123253543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404938824.

The product of its (nonzero) digits is 864000, while the sum is 41.

Adding to 20452123253543 its reverse (34535232125402), we get a palindrome (54987355378945).

The spelling of 20452123253543 in words is "twenty trillion, four hundred fifty-two billion, one hundred twenty-three million, two hundred fifty-three thousand, five hundred forty-three".