423421020 has 120 divisors (see below), whose sum is σ = 1449101808. Its totient is φ = 102643200.

The previous prime is 423421013. The next prime is 423421049. The reversal of 423421020 is 20124324.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 423420984 and 423421002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5940 + ... + 29700.

Almost surely, 2^423421020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 423421020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724550904).

423421020 is an abundant number, since it is smaller than the sum of its proper divisors (1025680788).

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

423421020 is a wasteful number, since it uses less digits than its factorization.

423421020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23793 (or 23782 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 423421020 is about 20577.1966020641. The cubic root of 423421020 is about 750.9150431407.

Adding to 423421020 its reverse (20124324), we get a palindrome (443545344).

The spelling of 423421020 in words is "four hundred twenty-three million, four hundred twenty-one thousand, twenty".