1123123203020 has 144 divisors (see below), whose sum is σ = 2910271482048. Its totient is φ = 354542469120.

The previous prime is 1123123203011. The next prime is 1123123203029. The reversal of 1123123203020 is 203023213211.

It is an interprime number because it is at equal distance from previous prime (1123123203011) and next prime (1123123203029).

It is a super-2 number, since 2×1123123203020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1123123202983 and 1123123203001.

It is not an unprimeable number, because it can be changed into a prime (1123123203029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 366912290 + ... + 366915350.

Almost surely, 2^{1123123203020} is an apocalyptic number.

1123123203020 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 1123123203020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1455135741024).

1123123203020 is an abundant number, since it is smaller than the sum of its proper divisors (1787148279028).

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

1123123203020 is a wasteful number, since it uses less digits than its factorization.

1123123203020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988 (or 3537 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1123123203020 its reverse (203023213211), we get a palindrome (1326146416231).

The spelling of 1123123203020 in words is "one trillion, one hundred twenty-three billion, one hundred twenty-three million, two hundred three thousand, twenty".