6551920 has 20 divisors (see below), whose sum is σ = 15233400. Its totient is φ = 2620736.

The previous prime is 6551917. The next prime is 6551921. The reversal of 6551920 is 291556.

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6551921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40870 + ... + 41029.

It is an arithmetic number, because the mean of its divisors is an integer number (761670).

Almost surely, 2^6551920 is an apocalyptic number.

It is an amenable number.

6551920 is an abundant number, since it is smaller than the sum of its proper divisors (8681480).

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

6551920 is a wasteful number, since it uses less digits than its factorization.

6551920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81912 (or 81906 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 6551920 is about 2559.6718539688. The cubic root of 6551920 is about 187.1211431570.

The spelling of 6551920 in words is "six million, five hundred fifty-one thousand, nine hundred twenty".