1311320020 has 24 divisors (see below), whose sum is σ = 2755720800. Its totient is φ = 524156832.

The previous prime is 1311319921. The next prime is 1311320027. The reversal of 1311320020 is 200231131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311320027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6711 + ... + 51649.

It is an arithmetic number, because the mean of its divisors is an integer number (114821700).

Almost surely, 2^1311320020 is an apocalyptic number.

1311320020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311320020 is an abundant number, since it is smaller than the sum of its proper divisors (1444400780).

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

1311320020 is a wasteful number, since it uses less digits than its factorization.

1311320020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46407 (or 46405 counting only the distinct ones).

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

The square root of 1311320020 is about 36212.1529324065. The cubic root of 1311320020 is about 1094.5515758021.

Adding to 1311320020 its reverse (200231131), we get a palindrome (1511551151).

Subtracting from 1311320020 its reverse (200231131), we obtain a square (1111088889 = 33333²).

It can be divided in two parts, 13113 and 20020, that added together give a palindrome (33133).

The spelling of 1311320020 in words is "one billion, three hundred eleven million, three hundred twenty thousand, twenty".