420201220 has 24 divisors (see below), whose sum is σ = 895595904. Its totient is φ = 165571296.

The previous prime is 420201163. The next prime is 420201239. The reversal of 420201220 is 22102024.

It is a self number, because there is not a number n which added to its sum of digits gives 420201220.

It is an unprimeable 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 in 7 ways as a sum of consecutive naturals, for example, 155452 + ... + 158131.

It is an arithmetic number, because the mean of its divisors is an integer number (37316496).

Almost surely, 2^420201220 is an apocalyptic number.

It is an amenable number.

420201220 is an abundant number, since it is smaller than the sum of its proper divisors (475394684).

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

420201220 is a wasteful number, since it uses less digits than its factorization.

420201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313659 (or 313657 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 420201220 is about 20498.8102093756. The cubic root of 420201220 is about 749.0068157309.

Adding to 420201220 its reverse (22102024), we get a palindrome (442303244).

The spelling of 420201220 in words is "four hundred twenty million, two hundred one thousand, two hundred twenty".