320002020 has 72 divisors (see below), whose sum is σ = 1045347576. Its totient is φ = 78769152.

The previous prime is 320001977. The next prime is 320002021. The reversal of 320002020 is 20200023.

It can be written as a sum of positive squares in 4 ways, for example, as 2663424 + 317338596 = 1632^2 + 17814^2 .

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 = 320001993 and 320002011.

It is not an unprimeable number, because it can be changed into a prime (320002021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66037 + ... + 70716.

Almost surely, 2^320002020 is an apocalyptic number.

320002020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320002020 is an abundant number, since it is smaller than the sum of its proper divisors (725345556).

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

320002020 is a wasteful number, since it uses less digits than its factorization.

320002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136781 (or 136776 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 320002020 is about 17888.6002806256. The cubic root of 320002020 is about 683.9918178974.

Adding to 320002020 its reverse (20200023), we get a palindrome (340202043).

The spelling of 320002020 in words is "three hundred twenty million, two thousand, twenty".