20123243401 has 4 divisors (see below), whose sum is σ = 20156071492. Its totient is φ = 20090415312.

The previous prime is 20123243377. The next prime is 20123243411. The reversal of 20123243401 is 10434232102.

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 9930321801 + 10192921600 = 99651^2 + 100960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123243401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123243411) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16413126 + ... + 16414351.

It is an arithmetic number, because the mean of its divisors is an integer number (5039017873).

Almost surely, 2^20123243401 is an apocalyptic number.

It is an amenable number.

20123243401 is a deficient number, since it is larger than the sum of its proper divisors (32828091).

20123243401 is an equidigital number, since it uses as much as digits as its factorization.

20123243401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32828090.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 20123243401 its reverse (10434232102), we get a palindrome (30557475503).

The spelling of 20123243401 in words is "twenty billion, one hundred twenty-three million, two hundred forty-three thousand, four hundred one".