123442020 has 144 divisors (see below), whose sum is σ = 409473792. Its totient is φ = 29917440.

The previous prime is 123442013. The next prime is 123442043. The reversal of 123442020 is 20244321.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 123441984 and 123442002.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 165769 + ... + 166511.

It is an arithmetic number, because the mean of its divisors is an integer number (2843568).

Almost surely, 2^123442020 is an apocalyptic number.

123442020 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 123442020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204736896).

123442020 is an abundant number, since it is smaller than the sum of its proper divisors (286031772).

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

123442020 is a wasteful number, since it uses less digits than its factorization.

123442020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 837 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 123442020 is about 11110.4464356749. The cubic root of 123442020 is about 497.9140026662.

Adding to 123442020 its reverse (20244321), we get a palindrome (143686341).

The spelling of 123442020 in words is "one hundred twenty-three million, four hundred forty-two thousand, twenty".