123123310220 has 48 divisors (see below), whose sum is σ = 276844417920. Its totient is φ = 45831481344.

The previous prime is 123123310217. The next prime is 123123310231. The reversal of 123123310220 is 22013321321.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 123123310192 and 123123310201.

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 15 ways as a sum of consecutive naturals, for example, 2004164 + ... + 2064683.

It is an arithmetic number, because the mean of its divisors is an integer number (5767592040).

Almost surely, 2^123123310220 is an apocalyptic number.

123123310220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123123310220 is an abundant number, since it is smaller than the sum of its proper divisors (153721107700).

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

123123310220 is a wasteful number, since it uses less digits than its factorization.

123123310220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068962 (or 4068960 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 123123310220 its reverse (22013321321), we get a palindrome (145136631541).

The spelling of 123123310220 in words is "one hundred twenty-three billion, one hundred twenty-three million, three hundred ten thousand, two hundred twenty".