1123201020 has 48 divisors (see below), whose sum is σ = 3150419328. Its totient is φ = 299000640.

The previous prime is 1123201007. The next prime is 1123201031. The reversal of 1123201020 is 201023211.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1123200987 and 1123201005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19275 + ... + 51165.

It is an arithmetic number, because the mean of its divisors is an integer number (65633736).

Almost surely, 2^1123201020 is an apocalyptic number.

1123201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123201020 is an abundant number, since it is smaller than the sum of its proper divisors (2027218308).

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

1123201020 is a wasteful number, since it uses less digits than its factorization.

1123201020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32490 (or 32488 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1123201020 is about 33514.1913224831. The cubic root of 1123201020 is about 1039.4872410685.

Adding to 1123201020 its reverse (201023211), we get a palindrome (1324224231).

The spelling of 1123201020 in words is "one billion, one hundred twenty-three million, two hundred one thousand, twenty".