1311203020 has 24 divisors (see below), whose sum is σ = 2800198800. Its totient is φ = 515591232.

The previous prime is 1311203017. The next prime is 1311203027. The reversal of 1311203020 is 203021131.

It is not an unprimeable number, because it can be changed into a prime (1311203027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 554415 + ... + 556774.

It is an arithmetic number, because the mean of its divisors is an integer number (116674950).

Almost surely, 2^1311203020 is an apocalyptic number.

1311203020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311203020 is an abundant number, since it is smaller than the sum of its proper divisors (1488995780).

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

1311203020 is a wasteful number, since it uses less digits than its factorization.

1311203020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111257 (or 1111255 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1311203020 is about 36210.5374166140. The cubic root of 1311203020 is about 1094.5190217494.

Adding to 1311203020 its reverse (203021131), we get a palindrome (1514224151).

The spelling of 1311203020 in words is "one billion, three hundred eleven million, two hundred three thousand, twenty".