6621920 has 24 divisors (see below), whose sum is σ = 15644664. Its totient is φ = 2648704.

The previous prime is 6621911. The next prime is 6621929. The reversal of 6621920 is 291266.

It is an interprime number because it is at equal distance from previous prime (6621911) and next prime (6621929).

It is a self number, because there is not a number n which added to its sum of digits gives 6621920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6621929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20534 + ... + 20853.

It is an arithmetic number, because the mean of its divisors is an integer number (651861).

Almost surely, 2^6621920 is an apocalyptic number.

It is an amenable number.

6621920 is an abundant number, since it is smaller than the sum of its proper divisors (9022744).

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

6621920 is a wasteful number, since it uses less digits than its factorization.

6621920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41402 (or 41394 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 6621920 is about 2573.3091535997. The cubic root of 6621920 is about 187.7851778910.

The spelling of 6621920 in words is "six million, six hundred twenty-one thousand, nine hundred twenty".