641322020 has 24 divisors (see below), whose sum is σ = 1347400824. Its totient is φ = 256409856.

The previous prime is 641322007. The next prime is 641322047. The reversal of 641322020 is 20223146.

It can be written as a sum of positive squares in 4 ways, for example, as 222546724 + 418775296 = 14918^2 + 20464^2 .

It is a super-2 number, since 2×641322020² = 822587866673760800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 641321983 and 641322001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46214 + ... + 58466.

It is an arithmetic number, because the mean of its divisors is an integer number (56141701).

Almost surely, 2^641322020 is an apocalyptic number.

It is an amenable number.

641322020 is an abundant number, since it is smaller than the sum of its proper divisors (706078804).

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

641322020 is a wasteful number, since it uses less digits than its factorization.

641322020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14879 (or 14877 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 641322020 is about 25324.3365164815. The cubic root of 641322020 is about 862.3668441083.

Adding to 641322020 its reverse (20223146), we get a palindrome (661545166).

The spelling of 641322020 in words is "six hundred forty-one million, three hundred twenty-two thousand, twenty".