620820 has 36 divisors (see below), whose sum is σ = 1883700. Its totient is φ = 165504.

The previous prime is 620813. The next prime is 620821. The reversal of 620820 is 28026.

It can be written as a sum of positive squares in 2 ways, for example, as 76176 + 544644 = 276^2 + 738^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 620793 and 620802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1545 + ... + 1904.

It is an arithmetic number, because the mean of its divisors is an integer number (52325).

2⁶²⁰⁸²⁰ is an apocalyptic number.

620820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

620820 is an abundant number, since it is smaller than the sum of its proper divisors (1262880).

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

620820 is a wasteful number, since it uses less digits than its factorization.

620820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3464 (or 3459 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 620820 is about 787.9213158685. The cubic root of 620820 is about 85.3077655063.

Adding to 620820 its reverse (28026), we get a palindrome (648846).

The spelling of 620820 in words is "six hundred twenty thousand, eight hundred twenty".