20123134455 has 16 divisors (see below), whose sum is σ = 32515799904. Its totient is φ = 10626076800.

The previous prime is 20123134391. The next prime is 20123134477. The reversal of 20123134455 is 55443132102.

It is not a de Polignac number, because 20123134455 - 2⁶ = 20123134391 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 6639784 + ... + 6642813.

It is an arithmetic number, because the mean of its divisors is an integer number (2032237494).

Almost surely, 2^20123134455 is an apocalyptic number.

20123134455 is a deficient number, since it is larger than the sum of its proper divisors (12392665449).

20123134455 is a wasteful number, since it uses less digits than its factorization.

20123134455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13282706.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 20123134455 its reverse (55443132102), we get a palindrome (75566266557).

The spelling of 20123134455 in words is "twenty billion, one hundred twenty-three million, one hundred thirty-four thousand, four hundred fifty-five".