1331023020 has 24 divisors (see below), whose sum is σ = 3726864624. Its totient is φ = 354939456.

The previous prime is 1331023019. The next prime is 1331023021. The reversal of 1331023020 is 203201331.

It is an interprime number because it is at equal distance from previous prime (1331023019) and next prime (1331023021).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (1331023021) 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, 11091799 + ... + 11091918.

It is an arithmetic number, because the mean of its divisors is an integer number (155286026).

Almost surely, 2^1331023020 is an apocalyptic number.

1331023020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331023020 is an abundant number, since it is smaller than the sum of its proper divisors (2395841604).

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

1331023020 is a wasteful number, since it uses less digits than its factorization.

1331023020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22183729 (or 22183727 counting only the distinct ones).

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

The square root of 1331023020 is about 36483.1881830522. The cubic root of 1331023020 is about 1100.0063415612.

Adding to 1331023020 its reverse (203201331), we get a palindrome (1534224351).

The spelling of 1331023020 in words is "one billion, three hundred thirty-one million, twenty-three thousand, twenty".