17800020442 has 8 divisors (see below), whose sum is σ = 28270620756. Its totient is φ = 8376480192.

The previous prime is 17800020397. The next prime is 17800020451. The reversal of 17800020442 is 24402000871.

It can be written as a sum of positive squares in 2 ways, for example, as 17646731281 + 153289161 = 132841^2 + 12381^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 17800020442.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261764973 + ... + 261765040.

Almost surely, 2^17800020442 is an apocalyptic number.

17800020442 is a deficient number, since it is larger than the sum of its proper divisors (10470600314).

17800020442 is a wasteful number, since it uses less digits than its factorization.

17800020442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523530032.

The product of its (nonzero) digits is 3584, while the sum is 28.

The spelling of 17800020442 in words is "seventeen billion, eight hundred million, twenty thousand, four hundred forty-two".