42400220020 has 12 divisors (see below), whose sum is σ = 89040462084. Its totient is φ = 16960088000.

The previous prime is 42400219973. The next prime is 42400220029. The reversal of 42400220020 is 2002200424.

It can be written as a sum of positive squares in 2 ways, for example, as 29789379216 + 12610840804 = 172596^2 + 112298^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42400219976 and 42400220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42400220029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060005481 + ... + 1060005520.

It is an arithmetic number, because the mean of its divisors is an integer number (7420038507).

Almost surely, 2^42400220020 is an apocalyptic number.

It is an amenable number.

42400220020 is an abundant number, since it is smaller than the sum of its proper divisors (46640242064).

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

42400220020 is a wasteful number, since it uses less digits than its factorization.

42400220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120011010 (or 2120011008 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 42400220020 its reverse (2002200424), we get a palindrome (44402420444).

The spelling of 42400220020 in words is "forty-two billion, four hundred million, two hundred twenty thousand, twenty".