20440021423242 has 32 divisors (see below), whose sum is σ = 42506774060544. Its totient is φ = 6545427148800.

The previous prime is 20440021423219. The next prime is 20440021423267. The reversal of 20440021423242 is 24232412004402.

It is a happy 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 15 ways as a sum of consecutive naturals, for example, 401042359 + ... + 401093322.

It is an arithmetic number, because the mean of its divisors is an integer number (1328336689392).

Almost surely, 2^{20440021423242} is an apocalyptic number.

20440021423242 is an abundant number, since it is smaller than the sum of its proper divisors (22066752637302).

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

20440021423242 is a wasteful number, since it uses less digits than its factorization.

20440021423242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802135854.

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 20440021423242 its reverse (24232412004402), we get a palindrome (44672433427644).

The spelling of 20440021423242 in words is "twenty trillion, four hundred forty billion, twenty-one million, four hundred twenty-three thousand, two hundred forty-two".