20434013123 has 4 divisors (see below), whose sum is σ = 20589998088. Its totient is φ = 20278028160.

The previous prime is 20434013111. The next prime is 20434013143. The reversal of 20434013123 is 32131043402.

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 20434013123 - 2⁶ = 20434013059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20434013143) 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, 77992286 + ... + 77992547.

It is an arithmetic number, because the mean of its divisors is an integer number (5147499522).

Almost surely, 2^20434013123 is an apocalyptic number.

20434013123 is a deficient number, since it is larger than the sum of its proper divisors (155984965).

20434013123 is a wasteful number, since it uses less digits than its factorization.

20434013123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155984964.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20434013123 its reverse (32131043402), we get a palindrome (52565056525).

The spelling of 20434013123 in words is "twenty billion, four hundred thirty-four million, thirteen thousand, one hundred twenty-three".