1123312020 has 24 divisors (see below), whose sum is σ = 3145273824. Its totient is φ = 299549856.

The previous prime is 1123311983. The next prime is 1123312027. The reversal of 1123312020 is 202133211.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123312027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9360874 + ... + 9360993.

It is an arithmetic number, because the mean of its divisors is an integer number (131053076).

Almost surely, 2^1123312020 is an apocalyptic number.

1123312020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123312020 is an abundant number, since it is smaller than the sum of its proper divisors (2021961804).

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

1123312020 is a wasteful number, since it uses less digits than its factorization.

1123312020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18721879 (or 18721877 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1123312020 is about 33515.8472964656. The cubic root of 1123312020 is about 1039.5214822776.

Adding to 1123312020 its reverse (202133211), we get a palindrome (1325445231).

The spelling of 1123312020 in words is "one billion, one hundred twenty-three million, three hundred twelve thousand, twenty".