420440022 has 48 divisors (see below), whose sum is σ = 973629072. Its totient is φ = 130659840.

The previous prime is 420440003. The next prime is 420440047. The reversal of 420440022 is 220044024.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 420439977 and 420440004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26322 + ... + 39162.

It is an arithmetic number, because the mean of its divisors is an integer number (20283939).

Almost surely, 2^420440022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 420440022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486814536).

420440022 is an abundant number, since it is smaller than the sum of its proper divisors (553189050).

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

420440022 is a wasteful number, since it uses less digits than its factorization.

420440022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12973 (or 12970 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 420440022 is about 20504.6341591358. The cubic root of 420440022 is about 749.1486766971.

Adding to 420440022 its reverse (220044024), we get a palindrome (640484046).

The spelling of 420440022 in words is "four hundred twenty million, four hundred forty thousand, twenty-two".