420220 has 12 divisors (see below), whose sum is σ = 882504. Its totient is φ = 168080.

The previous prime is 420193. The next prime is 420221. The reversal of 420220 is 22024.

It is a happy number.

420220 is nontrivially palindromic in base 14.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an Ulam number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 420197 and 420206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420221) 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, 10486 + ... + 10525.

It is an arithmetic number, because the mean of its divisors is an integer number (73542).

2⁴²⁰²²⁰ is an apocalyptic number.

It is an amenable number.

420220 is an abundant number, since it is smaller than the sum of its proper divisors (462284).

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

420220 is a wasteful number, since it uses less digits than its factorization.

420220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21020 (or 21018 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 420220 is about 648.2437813045. The cubic root of 420220 is about 74.9017973987.

Adding to 420220 its reverse (22024), we get a palindrome (442244).

The spelling of 420220 in words is "four hundred twenty thousand, two hundred twenty", and thus it is an iban number.