6420220620 has 96 divisors (see below), whose sum is σ = 19624985856. Its totient is φ = 1555296000.

The previous prime is 6420220619. The next prime is 6420220637. The reversal of 6420220620 is 260220246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1256070 + ... + 1261170.

It is an arithmetic number, because the mean of its divisors is an integer number (204426936).

Almost surely, 2^6420220620 is an apocalyptic number.

6420220620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6420220620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9812492928).

6420220620 is an abundant number, since it is smaller than the sum of its proper divisors (13204765236).

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

6420220620 is a wasteful number, since it uses less digits than its factorization.

6420220620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7031 (or 7029 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 6420220620 is about 80126.2792097574. The cubic root of 6420220620 is about 1858.5888070328.

Adding to 6420220620 its reverse (260220246), we get a palindrome (6680440866).

The spelling of 6420220620 in words is "six billion, four hundred twenty million, two hundred twenty thousand, six hundred twenty".