1313323220 has 24 divisors (see below), whose sum is σ = 3008704608. Its totient is φ = 477572000.

The previous prime is 1313323133. The next prime is 1313323241. The reversal of 1313323220 is 223233131.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1313323192 and 1313323201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2984606 + ... + 2985045.

It is an arithmetic number, because the mean of its divisors is an integer number (125362692).

Almost surely, 2^1313323220 is an apocalyptic number.

1313323220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1313323220 is an abundant number, since it is smaller than the sum of its proper divisors (1695381388).

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

1313323220 is a wasteful number, since it uses less digits than its factorization.

1313323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5969671 (or 5969669 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 1313323220 is about 36239.8015998984. The cubic root of 1313323220 is about 1095.1086455587.

Adding to 1313323220 its reverse (223233131), we get a palindrome (1536556351).

The spelling of 1313323220 in words is "one billion, three hundred thirteen million, three hundred twenty-three thousand, two hundred twenty".