420566 has 4 divisors (see below), whose sum is σ = 630852. Its totient is φ = 210282.

The previous prime is 420557. The next prime is 420569. The reversal of 420566 is 665024.

420566 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420569) by changing a digit.

420566 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105140 + ... + 105143.

It is an arithmetic number, because the mean of its divisors is an integer number (157713).

2⁴²⁰⁵⁶⁶ is an apocalyptic number.

420566 is a deficient number, since it is larger than the sum of its proper divisors (210286).

420566 is a wasteful number, since it uses less digits than its factorization.

420566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210285.

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

The square root of 420566 is about 648.5106013012. The cubic root of 420566 is about 74.9223492622.

The spelling of 420566 in words is "four hundred twenty thousand, five hundred sixty-six".