20434542025523 has 4 divisors (see below), whose sum is σ = 20506748888088. Its totient is φ = 20362335162960.

The previous prime is 20434542025489. The next prime is 20434542025537. The reversal of 20434542025523 is 32552024543402.

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 20434542025523 - 2¹⁰ = 20434542024499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20434542025223) 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, 36103430858 + ... + 36103431423.

It is an arithmetic number, because the mean of its divisors is an integer number (5126687222022).

Almost surely, 2^{20434542025523} is an apocalyptic number.

20434542025523 is a deficient number, since it is larger than the sum of its proper divisors (72206862565).

20434542025523 is an equidigital number, since it uses as much as digits as its factorization.

20434542025523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72206862564.

The product of its (nonzero) digits is 1152000, while the sum is 41.

Adding to 20434542025523 its reverse (32552024543402), we get a palindrome (52986566568925).

The spelling of 20434542025523 in words is "twenty trillion, four hundred thirty-four billion, five hundred forty-two million, twenty-five thousand, five hundred twenty-three".