123123012020 has 12 divisors (see below), whose sum is σ = 258558325284. Its totient is φ = 49249204800.

The previous prime is 123123012007. The next prime is 123123012037. The reversal of 123123012020 is 20210321321.

It can be written as a sum of positive squares in 2 ways, for example, as 42664554916 + 80458457104 = 206554^2 + 283652^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 123123012020.

It is a congruent number.

It is an unprimeable number.

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, 3078075281 + ... + 3078075320.

It is an arithmetic number, because the mean of its divisors is an integer number (21546527107).

Almost surely, 2^123123012020 is an apocalyptic number.

123123012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123123012020 is an abundant number, since it is smaller than the sum of its proper divisors (135435313264).

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

123123012020 is a wasteful number, since it uses less digits than its factorization.

123123012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6156150610 (or 6156150608 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 123123012020 its reverse (20210321321), we get a palindrome (143333333341).

The spelling of 123123012020 in words is "one hundred twenty-three billion, one hundred twenty-three million, twelve thousand, twenty".