6420524020 has 48 divisors (see below), whose sum is σ = 13965391440. Its totient is φ = 2476565504.

The previous prime is 6420524003. The next prime is 6420524021. The reversal of 6420524020 is 204250246.

It can be written as a sum of positive squares in 8 ways, for example, as 307160676 + 6113363344 = 17526^2 + 78188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420524021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 490602 + ... + 503518.

It is an arithmetic number, because the mean of its divisors is an integer number (290945655).

Almost surely, 2^6420524020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6420524020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6982695720).

6420524020 is an abundant number, since it is smaller than the sum of its proper divisors (7544867420).

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

6420524020 is a wasteful number, since it uses less digits than its factorization.

6420524020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13812 (or 13810 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 6420524020 is about 80128.1724488959. The cubic root of 6420524020 is about 1858.6180836468.

Adding to 6420524020 its reverse (204250246), we get a palindrome (6624774266).

The spelling of 6420524020 in words is "six billion, four hundred twenty million, five hundred twenty-four thousand, twenty".