620546 has 4 divisors (see below), whose sum is σ = 930822. Its totient is φ = 310272.

The previous prime is 620531. The next prime is 620549. The reversal of 620546 is 645026.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 645026 = 2 ⋅322513.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 151321 = 685^2 + 389^2 .

It is not an unprimeable number, because it can be changed into a prime (620549) by changing a digit.

620546 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155135 + ... + 155138.

620546 is a Friedman number, since it can be written as 606*4^5+2, using all its digits and the basic arithmetic operations.

2⁶²⁰⁵⁴⁶ is an apocalyptic number.

620546 is a deficient number, since it is larger than the sum of its proper divisors (310276).

620546 is a wasteful number, since it uses less digits than its factorization.

620546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310275.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 620546 is about 787.7474214493. The cubic root of 620546 is about 85.2952134153.

The spelling of 620546 in words is "six hundred twenty thousand, five hundred forty-six".