620605 has 4 divisors (see below), whose sum is σ = 744732. Its totient is φ = 496480.

The previous prime is 620603. The next prime is 620623. The reversal of 620605 is 506026.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506026 = 2 ⋅253013.

It can be written as a sum of positive squares in 2 ways, for example, as 264196 + 356409 = 514^2 + 597^2 .

It is not a de Polignac number, because 620605 - 2¹ = 620603 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620603) by changing a digit.

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, 62056 + ... + 62065.

It is an arithmetic number, because the mean of its divisors is an integer number (186183).

2⁶²⁰⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

620605 is a deficient number, since it is larger than the sum of its proper divisors (124127).

620605 is a wasteful number, since it uses less digits than its factorization.

620605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124126.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 620605 is about 787.7848691109. The cubic root of 620605 is about 85.2979165499.

It can be divided in two parts, 620 and 605, that added together give a triangular number (1225 = T₄₉).

The spelling of 620605 in words is "six hundred twenty thousand, six hundred five".