20123123113 has 4 divisors (see below), whose sum is σ = 20817023940. Its totient is φ = 19429222288.

The previous prime is 20123123089. The next prime is 20123123129. The reversal of 20123123113 is 31132132102.

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 6101484544 + 14021638569 = 78112^2 + 118413^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123123113 - 2¹⁷ = 20122992041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123123183) 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, 346950370 + ... + 346950427.

It is an arithmetic number, because the mean of its divisors is an integer number (5204255985).

Almost surely, 2^20123123113 is an apocalyptic number.

It is an amenable number.

20123123113 is a deficient number, since it is larger than the sum of its proper divisors (693900827).

20123123113 is an equidigital number, since it uses as much as digits as its factorization.

20123123113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693900826.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20123123113 its reverse (31132132102), we get a palindrome (51255255215).

The spelling of 20123123113 in words is "twenty billion, one hundred twenty-three million, one hundred twenty-three thousand, one hundred thirteen".