20123220423 has 8 divisors (see below), whose sum is σ = 26831645568. Its totient is φ = 13415137784.

The previous prime is 20123220361. The next prime is 20123220431. The reversal of 20123220423 is 32402232102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20123220423 - 2⁸ = 20123220167 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20123220423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123220323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126640 + ... + 237242.

It is an arithmetic number, because the mean of its divisors is an integer number (3353955696).

Almost surely, 2^20123220423 is an apocalyptic number.

20123220423 is a deficient number, since it is larger than the sum of its proper divisors (6708425145).

20123220423 is a wasteful number, since it uses less digits than its factorization.

20123220423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171253.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20123220423 its reverse (32402232102), we get a palindrome (52525452525).

The spelling of 20123220423 in words is "twenty billion, one hundred twenty-three million, two hundred twenty thousand, four hundred twenty-three".