123243020 has 48 divisors (see below), whose sum is σ = 265356000. Its totient is φ = 48062976.

The previous prime is 123243019. The next prime is 123243023. The reversal of 123243020 is 20342321.

It is a self number, because there is not a number n which added to its sum of digits gives 123243020.

It is not an unprimeable number, because it can be changed into a prime (123243023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246731 + ... + 247229.

It is an arithmetic number, because the mean of its divisors is an integer number (5528250).

Almost surely, 2^123243020 is an apocalyptic number.

123243020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123243020 is an abundant number, since it is smaller than the sum of its proper divisors (142112980).

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

123243020 is a wasteful number, since it uses less digits than its factorization.

123243020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 792 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 123243020 is about 11101.4872877466. The cubic root of 123243020 is about 497.6462975554.

Adding to 123243020 its reverse (20342321), we get a palindrome (143585341).

The spelling of 123243020 in words is "one hundred twenty-three million, two hundred forty-three thousand, twenty".