123000020 has 96 divisors (see below), whose sum is σ = 314133120. Its totient is φ = 39836160.

The previous prime is 123000019. The next prime is 123000023. The reversal of 123000020 is 20000321.

It is a junction number, because it is equal to n+sod(n) for n = 122999971 and 123000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123000023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82199 + ... + 83681.

It is an arithmetic number, because the mean of its divisors is an integer number (3272220).

Almost surely, 2^123000020 is an apocalyptic number.

123000020 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 123000020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157066560).

123000020 is an abundant number, since it is smaller than the sum of its proper divisors (191133100).

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

123000020 is a wasteful number, since it uses less digits than its factorization.

123000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1543 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 123000020 is about 11090.5374080790. The cubic root of 123000020 is about 497.3190102818.

Adding to 123000020 its reverse (20000321), we get a palindrome (143000341).

The spelling of 123000020 in words is "one hundred twenty-three million, twenty", and thus it is an aban number.