423640020 has 24 divisors (see below), whose sum is σ = 1186192224. Its totient is φ = 112970656.

The previous prime is 423639989. The next prime is 423640027. The reversal of 423640020 is 20046324.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423640027) 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 7 ways as a sum of consecutive naturals, for example, 3530274 + ... + 3530393.

It is an arithmetic number, because the mean of its divisors is an integer number (49424676).

Almost surely, 2^423640020 is an apocalyptic number.

It is an amenable number.

423640020 is an abundant number, since it is smaller than the sum of its proper divisors (762552204).

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

423640020 is a wasteful number, since it uses less digits than its factorization.

423640020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7060679 (or 7060677 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 423640020 is about 20582.5173387514. The cubic root of 423640020 is about 751.0444825109.

Adding to 423640020 its reverse (20046324), we get a palindrome (443686344).

The spelling of 423640020 in words is "four hundred twenty-three million, six hundred forty thousand, twenty".