6620404020 has 96 divisors (see below), whose sum is σ = 19542491136. Its totient is φ = 1672118400.

The previous prime is 6620404013. The next prime is 6620404069. The reversal of 6620404020 is 204040266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49555 + ... + 125285.

It is an arithmetic number, because the mean of its divisors is an integer number (203567616).

Almost surely, 2^6620404020 is an apocalyptic number.

6620404020 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 6620404020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9771245568).

6620404020 is an abundant number, since it is smaller than the sum of its proper divisors (12922087116).

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

6620404020 is a wasteful number, since it uses less digits than its factorization.

6620404020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75821 (or 75819 counting only the distinct ones).

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

The square root of 6620404020 is about 81365.8652015696. The cubic root of 6620404020 is about 1877.7084668489.

Adding to 6620404020 its reverse (204040266), we get a palindrome (6824444286).

It can be divided in two parts, 6 and 620404020, that added together give a palindrome (620404026).

The spelling of 6620404020 in words is "six billion, six hundred twenty million, four hundred four thousand, twenty".