6420620 has 12 divisors (see below), whose sum is σ = 13483344. Its totient is φ = 2568240.

The previous prime is 6420599. The next prime is 6420683. The reversal of 6420620 is 260246.

It is a super-2 number, since 2×6420620² = 82448722368800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 321031 = 6420620 / (6 + 4 + 2 + 0 + 6 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 6420592 and 6420601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160496 + ... + 160535.

It is an arithmetic number, because the mean of its divisors is an integer number (1123612).

Almost surely, 2^6420620 is an apocalyptic number.

It is an amenable number.

6420620 is an abundant number, since it is smaller than the sum of its proper divisors (7062724).

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

6420620 is a wasteful number, since it uses less digits than its factorization.

6420620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321040 (or 321038 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 6420620 is about 2533.8942361511. The cubic root of 6420620 is about 185.8627345055.

Adding to 6420620 its reverse (260246), we get a palindrome (6680866).

The spelling of 6420620 in words is "six million, four hundred twenty thousand, six hundred twenty".