6621047020 has 24 divisors (see below), whose sum is σ = 15890513184. Its totient is φ = 2270073216.

The previous prime is 6621047009. The next prime is 6621047023. The reversal of 6621047020 is 207401266.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 6621047020.

It is not an unprimeable number, because it can be changed into a prime (6621047023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23646457 + ... + 23646736.

It is an arithmetic number, because the mean of its divisors is an integer number (662104716).

Almost surely, 2^6621047020 is an apocalyptic number.

It is an amenable number.

6621047020 is an abundant number, since it is smaller than the sum of its proper divisors (9269466164).

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

6621047020 is a wasteful number, since it uses less digits than its factorization.

6621047020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47293209 (or 47293207 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 6621047020 is about 81369.8163940413. The cubic root of 6621047020 is about 1877.7692550554.

Adding to 6621047020 its reverse (207401266), we get a palindrome (6828448286).

It can be divided in two parts, 662104 and 7020, that added together give a square (669124 = 818²).

The spelling of 6621047020 in words is "six billion, six hundred twenty-one million, forty-seven thousand, twenty".