6221720 has 32 divisors (see below), whose sum is σ = 14137200. Its totient is φ = 2464128.

The previous prime is 6221693. The next prime is 6221749. The reversal of 6221720 is 271226.

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

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 6221692 and 6221701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3647 + ... + 5073.

Almost surely, 2^6221720 is an apocalyptic number.

It is an amenable number.

6221720 is an abundant number, since it is smaller than the sum of its proper divisors (7915480).

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

6221720 is a wasteful number, since it uses less digits than its factorization.

6221720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547 (or 1543 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 6221720 is about 2494.3375874167. The cubic root of 6221720 is about 183.9233297457.

Adding to 6221720 its reverse (271226), we get a palindrome (6492946).

The spelling of 6221720 in words is "six million, two hundred twenty-one thousand, seven hundred twenty".