20123203129 has 4 divisors (see below), whose sum is σ = 20123538676. Its totient is φ = 20122867584.

The previous prime is 20123203123. The next prime is 20123203157. The reversal of 20123203129 is 92130232102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 340218025 + 19782985104 = 18445^2 + 140652^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123203129 - 2⁵ = 20123203097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123203123) 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, 50484 + ... + 206869.

It is an arithmetic number, because the mean of its divisors is an integer number (5030884669).

Almost surely, 2^20123203129 is an apocalyptic number.

It is an amenable number.

20123203129 is a deficient number, since it is larger than the sum of its proper divisors (335547).

20123203129 is an equidigital number, since it uses as much as digits as its factorization.

20123203129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335546.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 20123203129 in words is "twenty billion, one hundred twenty-three million, two hundred three thousand, one hundred twenty-nine".