1312345020 has 48 divisors (see below), whose sum is σ = 4199505408. Its totient is φ = 299964480.

The previous prime is 1312345019. The next prime is 1312345037. The reversal of 1312345020 is 205432131.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1561896 + ... + 1562735.

It is an arithmetic number, because the mean of its divisors is an integer number (87489696).

Almost surely, 2^1312345020 is an apocalyptic number.

1312345020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312345020 is an abundant number, since it is smaller than the sum of its proper divisors (2887160388).

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

1312345020 is a wasteful number, since it uses less digits than its factorization.

1312345020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3124650 (or 3124648 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1312345020 is about 36226.3028751210. The cubic root of 1312345020 is about 1094.8366888073.

Adding to 1312345020 its reverse (205432131), we get a palindrome (1517777151).

The spelling of 1312345020 in words is "one billion, three hundred twelve million, three hundred forty-five thousand, twenty".