423001440020 has 12 divisors (see below), whose sum is σ = 888303024084. Its totient is φ = 169200576000.

The previous prime is 423001439983. The next prime is 423001440049. The reversal of 423001440020 is 20044100324.

It can be written as a sum of positive squares in 2 ways, for example, as 208843516036 + 214157923984 = 456994^2 + 462772^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 21150072001 = 423001440020 / (4 + 2 + 3 + 0 + 0 + 1 + 4 + 4 + 0 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 423001439974 and 423001440001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10575035981 + ... + 10575036020.

It is an arithmetic number, because the mean of its divisors is an integer number (74025252007).

Almost surely, 2^423001440020 is an apocalyptic number.

It is an amenable number.

423001440020 is an abundant number, since it is smaller than the sum of its proper divisors (465301584064).

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

423001440020 is a wasteful number, since it uses less digits than its factorization.

423001440020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21150072010 (or 21150072008 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 423001440020 its reverse (20044100324), we get a palindrome (443045540344).

The spelling of 423001440020 in words is "four hundred twenty-three billion, one million, four hundred forty thousand, twenty".