20440240420442 has 16 divisors (see below), whose sum is σ = 30828940853832. Its totient is φ = 10163970384960.

The previous prime is 20440240420441. The next prime is 20440240420499. The reversal of 20440240420442 is 24402404204402.

It can be written as a sum of positive squares in 4 ways, for example, as 16630010596081 + 3810229824361 = 4077991^2 + 1951981^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20440240420399 and 20440240420408.

It is not an unprimeable number, because it can be changed into a prime (20440240420441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9956213 + ... + 11832440.

Almost surely, 2^{20440240420442} is an apocalyptic number.

20440240420442 is a deficient number, since it is larger than the sum of its proper divisors (10388700433390).

20440240420442 is a wasteful number, since it uses less digits than its factorization.

20440240420442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21791233.

The product of its (nonzero) digits is 65536, while the sum is 32.

Adding to 20440240420442 its reverse (24402404204402), we get a palindrome (44842644624844).

The spelling of 20440240420442 in words is "twenty trillion, four hundred forty billion, two hundred forty million, four hundred twenty thousand, four hundred forty-two".