420224240 has 20 divisors (see below), whose sum is σ = 977021544. Its totient is φ = 168089664.

The previous prime is 420224213. The next prime is 420224243. The reversal of 420224240 is 42422024.

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

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420224243) 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, 2626322 + ... + 2626481.

Almost surely, 2^420224240 is an apocalyptic number.

420224240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420224240 is an abundant number, since it is smaller than the sum of its proper divisors (556797304).

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

420224240 is a wasteful number, since it uses less digits than its factorization.

420224240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252816 (or 5252810 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 420224240 is about 20499.3716976887. The cubic root of 420224240 is about 749.0204931639.

Adding to 420224240 its reverse (42422024), we get a palindrome (462646264).

The spelling of 420224240 in words is "four hundred twenty million, two hundred twenty-four thousand, two hundred forty".