6221820 has 72 divisors (see below), whose sum is σ = 19171152. Its totient is φ = 1506560.

The previous prime is 6221819. The next prime is 6221827. The reversal of 6221820 is 281226.

It is a super-2 number, since 2×6221820² = 77422088224800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6221827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6832 + ... + 7688.

It is an arithmetic number, because the mean of its divisors is an integer number (266266).

Almost surely, 2^6221820 is an apocalyptic number.

6221820 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 6221820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9585576).

6221820 is an abundant number, since it is smaller than the sum of its proper divisors (12949332).

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

6221820 is a wasteful number, since it uses less digits than its factorization.

6221820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 6221820 is about 2494.3576327383. The cubic root of 6221820 is about 183.9243151235.

It can be divided in two parts, 622 and 1820, that added together give a palindrome (2442).

The spelling of 6221820 in words is "six million, two hundred twenty-one thousand, eight hundred twenty".