420424240 has 20 divisors (see below), whose sum is σ = 977486544. Its totient is φ = 168169664.

The previous prime is 420424237. The next prime is 420424241. The reversal of 420424240 is 42424024.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (420424241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2627572 + ... + 2627731.

Almost surely, 2^420424240 is an apocalyptic number.

420424240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420424240 is an abundant number, since it is smaller than the sum of its proper divisors (557062304).

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

420424240 is a wasteful number, since it uses less digits than its factorization.

420424240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255316 (or 5255310 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

The square root of 420424240 is about 20504.2493156906. The cubic root of 420424240 is about 749.1393030158.

Adding to 420424240 its reverse (42424024), we get a palindrome (462848264).

The spelling of 420424240 in words is "four hundred twenty million, four hundred twenty-four thousand, two hundred forty".