6620331 has 16 divisors (see below), whose sum is σ = 9083520. Its totient is φ = 4287360.

The previous prime is 6620309. The next prime is 6620351. The reversal of 6620331 is 1330266.

It is not a de Polignac number, because 6620331 - 2²² = 2426027 is a prime.

It is a super-2 number, since 2×6620331² = 87657565099122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6620298 and 6620307.

It is not an unprimeable number, because it can be changed into a prime (6620351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19836 + ... + 20166.

It is an arithmetic number, because the mean of its divisors is an integer number (567720).

Almost surely, 2^6620331 is an apocalyptic number.

6620331 is a deficient number, since it is larger than the sum of its proper divisors (2463189).

6620331 is a wasteful number, since it uses less digits than its factorization.

6620331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 6620331 is about 2573.0003886514. Note that the first 3 decimals coincide. The cubic root of 6620331 is about 187.7701563404.

Adding to 6620331 its reverse (1330266), we get a palindrome (7950597).

The spelling of 6620331 in words is "six million, six hundred twenty thousand, three hundred thirty-one".