1313320020 has 24 divisors (see below), whose sum is σ = 3677296224. Its totient is φ = 350218656.

The previous prime is 1313320009. The next prime is 1313320027. The reversal of 1313320020 is 200233131.

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 (1313320027) 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, 10944274 + ... + 10944393.

It is an arithmetic number, because the mean of its divisors is an integer number (153220676).

Almost surely, 2^1313320020 is an apocalyptic number.

1313320020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1313320020 is an abundant number, since it is smaller than the sum of its proper divisors (2363976204).

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

1313320020 is a wasteful number, since it uses less digits than its factorization.

1313320020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21888679 (or 21888677 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 1313320020 is about 36239.7574495194. The cubic root of 1313320020 is about 1095.1077561228.

Adding to 1313320020 its reverse (200233131), we get a palindrome (1513553151).

It can be divided in two parts, 13133 and 20020, that added together give a triangular number (33153 = T₂₅₇).

The spelling of 1313320020 in words is "one billion, three hundred thirteen million, three hundred twenty thousand, twenty".