20345123 has 4 divisors (see below), whose sum is σ = 20374848. Its totient is φ = 20315400.

The previous prime is 20345093. The next prime is 20345161. The reversal of 20345123 is 32154302.

It is a happy number.

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 20345123 - 2¹⁰ = 20344099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20345095 and 20345104.

It is not an unprimeable number, because it can be changed into a prime (20345023) 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, 13811 + ... + 15212.

It is an arithmetic number, because the mean of its divisors is an integer number (5093712).

Almost surely, 2^20345123 is an apocalyptic number.

20345123 is a deficient number, since it is larger than the sum of its proper divisors (29725).

20345123 is an equidigital number, since it uses as much as digits as its factorization.

20345123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29724.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20345123 is about 4510.5568392384. The cubic root of 20345123 is about 272.9942124210.

Adding to 20345123 its reverse (32154302), we get a palindrome (52499425).

The spelling of 20345123 in words is "twenty million, three hundred forty-five thousand, one hundred twenty-three".