123005115220 has 96 divisors (see below), whose sum is σ = 282666464640. Its totient is φ = 44689344000.

The previous prime is 123005115203. The next prime is 123005115241. The reversal of 123005115220 is 22511500321.

It is a junction number, because it is equal to n+sod(n) for n = 123005115191 and 123005115200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5405226 + ... + 5427934.

It is an arithmetic number, because the mean of its divisors is an integer number (2944442340).

Almost surely, 2^123005115220 is an apocalyptic number.

123005115220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123005115220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141333232320).

123005115220 is an abundant number, since it is smaller than the sum of its proper divisors (159661349420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123005115220 is a wasteful number, since it uses less digits than its factorization.

123005115220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23065 (or 23063 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

Adding to 123005115220 its reverse (22511500321), we get a palindrome (145516615541).

The spelling of 123005115220 in words is "one hundred twenty-three billion, five million, one hundred fifteen thousand, two hundred twenty".