1000321020 has 72 divisors (see below), whose sum is σ = 3132205440. Its totient is φ = 258145920.

The previous prime is 1000320967. The next prime is 1000321027. The reversal of 1000321020 is 201230001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1000320993 and 1000321011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000321027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84055 + ... + 95214.

Almost surely, 2^1000321020 is an apocalyptic number.

1000321020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000321020 is an abundant number, since it is smaller than the sum of its proper divisors (2131884420).

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

1000321020 is a wasteful number, since it uses less digits than its factorization.

1000321020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179315 (or 179310 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1000321020 is about 31627.8519662654. The cubic root of 1000321020 is about 1000.1069952183.

Adding to 1000321020 its reverse (201230001), we get a palindrome (1201551021).

The spelling of 1000321020 in words is "one billion, three hundred twenty-one thousand, twenty".