420520220 has 72 divisors (see below), whose sum is σ = 925984752. Its totient is φ = 160312320.

The previous prime is 420520187. The next prime is 420520237. The reversal of 420520220 is 22025024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4335212 + ... + 4335308.

Almost surely, 2^420520220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420520220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (462992376).

420520220 is an abundant number, since it is smaller than the sum of its proper divisors (505464532).

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

420520220 is a wasteful number, since it uses less digits than its factorization.

420520220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 420520220 is about 20506.5896725906. The cubic root of 420520220 is about 749.1963064840.

Adding to 420520220 its reverse (22025024), we get a palindrome (442545244).

The spelling of 420520220 in words is "four hundred twenty million, five hundred twenty thousand, two hundred twenty".