420664240 has 20 divisors (see below), whose sum is σ = 978044544. Its totient is φ = 168265664.

The previous prime is 420664229. The next prime is 420664249. The reversal of 420664240 is 42466024.

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

It is a junction number, because it is equal to n+sod(n) for n = 420664199 and 420664208.

It is not an unprimeable number, because it can be changed into a prime (420664249) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2629072 + ... + 2629231.

Almost surely, 2^420664240 is an apocalyptic number.

420664240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420664240 is an abundant number, since it is smaller than the sum of its proper divisors (557380304).

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

420664240 is a wasteful number, since it uses less digits than its factorization.

420664240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5258316 (or 5258310 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 420664240 is about 20510.1009261291. The cubic root of 420664240 is about 749.2818251119.

The spelling of 420664240 in words is "four hundred twenty million, six hundred sixty-four thousand, two hundred forty".