20123123020 has 144 divisors (see below), whose sum is σ = 57752358048. Its totient is φ = 5789629440.

The previous prime is 20123123017. The next prime is 20123123047. The reversal of 20123123020 is 2032132102.

It is a junction number, because it is equal to n+sod(n) for n = 20123122985 and 20123123003.

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, 68344 + ... + 211936.

It is an arithmetic number, because the mean of its divisors is an integer number (401058042).

Almost surely, 2^20123123020 is an apocalyptic number.

20123123020 is a gapful number since it is divisible by the number (20) 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 20123123020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28876179024).

20123123020 is an abundant number, since it is smaller than the sum of its proper divisors (37629235028).

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

20123123020 is a wasteful number, since it uses less digits than its factorization.

20123123020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143640 (or 143631 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20123123020 its reverse (2032132102), we get a palindrome (22155255122).

The spelling of 20123123020 in words is "twenty billion, one hundred twenty-three million, one hundred twenty-three thousand, twenty".