420020544 has 56 divisors (see below), whose sum is σ = 1116990400. Its totient is φ = 139290624.

The previous prime is 420020539. The next prime is 420020551. The reversal of 420020544 is 445020024.

It is a self number, because there is not a number n which added to its sum of digits gives 420020544.

It is a congruent number.

It is an unprimeable 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 in 7 ways as a sum of consecutive naturals, for example, 32712 + ... + 43704.

Almost surely, 2^420020544 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 420020544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (558495200).

420020544 is an abundant number, since it is smaller than the sum of its proper divisors (696969856).

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

420020544 is a wasteful number, since it uses less digits than its factorization.

420020544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11207 (or 11197 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 420020544 is about 20494.4027480676. The cubic root of 420020544 is about 748.8994489509.

Adding to 420020544 its reverse (445020024), we get a palindrome (865040568).

The spelling of 420020544 in words is "four hundred twenty million, twenty thousand, five hundred forty-four".