42240420020 has 12 divisors (see below), whose sum is σ = 88704882084. Its totient is φ = 16896168000.

The previous prime is 42240420011. The next prime is 42240420037. The reversal of 42240420020 is 2002404224.

It can be written as a sum of positive squares in 2 ways, for example, as 4757136784 + 37483283236 = 68972^2 + 193606^2 .

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: 2112021001 = 42240420020 / (4 + 2 + 2 + 4 + 0 + 4 + 2 + 0 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 42240419974 and 42240420001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056010481 + ... + 1056010520.

It is an arithmetic number, because the mean of its divisors is an integer number (7392073507).

Almost surely, 2^42240420020 is an apocalyptic number.

It is an amenable number.

42240420020 is an abundant number, since it is smaller than the sum of its proper divisors (46464462064).

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

42240420020 is a wasteful number, since it uses less digits than its factorization.

42240420020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112021010 (or 2112021008 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 42240420020 its reverse (2002404224), we get a palindrome (44242824244).

The spelling of 42240420020 in words is "forty-two billion, two hundred forty million, four hundred twenty thousand, twenty".