1031311020 has 48 divisors (see below), whose sum is σ = 2906090208. Its totient is φ = 273262080.

The previous prime is 1031311009. The next prime is 1031311037. The reversal of 1031311020 is 201131301.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1031310987 and 1031311005.

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, 45321 + ... + 64160.

It is an arithmetic number, because the mean of its divisors is an integer number (60543546).

Almost surely, 2^1031311020 is an apocalyptic number.

1031311020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1031311020 is an abundant number, since it is smaller than the sum of its proper divisors (1874779188).

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

1031311020 is a wasteful number, since it uses less digits than its factorization.

1031311020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109650 (or 109648 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1031311020 is about 32114.0315127204. The cubic root of 1031311020 is about 1010.3299317497.

Adding to 1031311020 its reverse (201131301), we get a palindrome (1232442321).

The spelling of 1031311020 in words is "one billion, thirty-one million, three hundred eleven thousand, twenty".