20808004042 has 32 divisors (see below), whose sum is σ = 36207388800. Its totient is φ = 8784484800.

The previous prime is 20808004039. The next prime is 20808004051. The reversal of 20808004042 is 24040080802.

It is a self number, because there is not a number n which added to its sum of digits gives 20808004042.

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, 241209 + ... + 315907.

It is an arithmetic number, because the mean of its divisors is an integer number (1131480900).

Almost surely, 2^20808004042 is an apocalyptic number.

20808004042 is a deficient number, since it is larger than the sum of its proper divisors (15399384758).

20808004042 is a wasteful number, since it uses less digits than its factorization.

20808004042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75006.

The product of its (nonzero) digits is 4096, while the sum is 28.

Adding to 20808004042 its reverse (24040080802), we get a palindrome (44848084844).

The spelling of 20808004042 in words is "twenty billion, eight hundred eight million, four thousand, forty-two".