20123354534 has 32 divisors (see below), whose sum is σ = 31953567744. Its totient is φ = 9485704800.

The previous prime is 20123354521. The next prime is 20123354549. The reversal of 20123354534 is 43545332102.

It is a self number, because there is not a number n which added to its sum of digits gives 20123354534.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1026347 + ... + 1045769.

It is an arithmetic number, because the mean of its divisors is an integer number (998548992).

Almost surely, 2^20123354534 is an apocalyptic number.

20123354534 is a deficient number, since it is larger than the sum of its proper divisors (11830213210).

20123354534 is a wasteful number, since it uses less digits than its factorization.

20123354534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19772.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 20123354534 its reverse (43545332102), we get a palindrome (63668686636).

The spelling of 20123354534 in words is "twenty billion, one hundred twenty-three million, three hundred fifty-four thousand, five hundred thirty-four".