421440020 has 24 divisors (see below), whose sum is σ = 885419304. Its totient is φ = 168500736.

The previous prime is 421440001. The next prime is 421440037. The reversal of 421440020 is 20044124.

It can be written as a sum of positive squares in 4 ways, for example, as 34058896 + 387381124 = 5836^2 + 19682^2 .

It is a super-2 number, since 2×421440020² = 355223380915200800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70592 + ... + 76328.

It is an arithmetic number, because the mean of its divisors is an integer number (36892471).

Almost surely, 2^421440020 is an apocalyptic number.

It is an amenable number.

421440020 is an abundant number, since it is smaller than the sum of its proper divisors (463979284).

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

421440020 is a wasteful number, since it uses less digits than its factorization.

421440020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9419 (or 9417 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 421440020 is about 20529.0043596858. The cubic root of 421440020 is about 749.7421454323.

Adding to 421440020 its reverse (20044124), we get a palindrome (441484144).

The spelling of 421440020 in words is "four hundred twenty-one million, four hundred forty thousand, twenty".