20442440242406 has 32 divisors (see below), whose sum is σ = 37740281419008. Its totient is φ = 8087035272480.

The previous prime is 20442440242391. The next prime is 20442440242423. The reversal of 20442440242406 is 60424204424402.

It is a self number, because there is not a number n which added to its sum of digits gives 20442440242406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18756761 + ... + 19816683.

It is an arithmetic number, because the mean of its divisors is an integer number (1179383794344).

Almost surely, 2^{20442440242406} is an apocalyptic number.

20442440242406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20442440242406 is a deficient number, since it is larger than the sum of its proper divisors (17297841176602).

20442440242406 is a wasteful number, since it uses less digits than its factorization.

20442440242406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165916.

The product of its (nonzero) digits is 393216, while the sum is 38.

Adding to 20442440242406 its reverse (60424204424402), we get a palindrome (80866644666808).

The spelling of 20442440242406 in words is "twenty trillion, four hundred forty-two billion, four hundred forty million, two hundred forty-two thousand, four hundred six".