420520044 has 24 divisors (see below), whose sum is σ = 1121387008. Its totient is φ = 120148560.

The previous prime is 420520043. The next prime is 420520049. The reversal of 420520044 is 440025024.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 420520044.

It is not an unprimeable number, because it can be changed into a prime (420520043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2503012 + ... + 2503179.

Almost surely, 2^420520044 is an apocalyptic number.

It is an amenable number.

420520044 is an abundant number, since it is smaller than the sum of its proper divisors (700866964).

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

420520044 is a wasteful number, since it uses less digits than its factorization.

420520044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5006205 (or 5006203 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 420520044 is about 20506.5853812867. The cubic root of 420520044 is about 749.1962019638.

Adding to 420520044 its reverse (440025024), we get a palindrome (860545068).

The spelling of 420520044 in words is "four hundred twenty million, five hundred twenty thousand, forty-four".