423331220 has 24 divisors (see below), whose sum is σ = 957380424. Its totient is φ = 156306816.

The previous prime is 423331213. The next prime is 423331253. The reversal of 423331220 is 22133324.

It can be written as a sum of positive squares in 4 ways, for example, as 1110916 + 422220304 = 1054^2 + 20548^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 423331192 and 423331201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813839 + ... + 814358.

It is an arithmetic number, because the mean of its divisors is an integer number (39890851).

Almost surely, 2^423331220 is an apocalyptic number.

It is an amenable number.

423331220 is an abundant number, since it is smaller than the sum of its proper divisors (534049204).

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

423331220 is a wasteful number, since it uses less digits than its factorization.

423331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628219 (or 1628217 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 423331220 is about 20575.0144592902. The cubic root of 423331220 is about 750.8619541857.

Adding to 423331220 its reverse (22133324), we get a palindrome (445464544).

It can be divided in two parts, 4233 and 31220, that added together give a palindrome (35453).

The spelling of 423331220 in words is "four hundred twenty-three million, three hundred thirty-one thousand, two hundred twenty".