20047558 has 4 divisors (see below), whose sum is σ = 30071340. Its totient is φ = 10023778.

The previous prime is 20047543. The next prime is 20047561. The reversal of 20047558 is 85574002.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5011888 + ... + 5011891.

It is an arithmetic number, because the mean of its divisors is an integer number (7517835).

Almost surely, 2^20047558 is an apocalyptic number.

20047558 is a deficient number, since it is larger than the sum of its proper divisors (10023782).

20047558 is a wasteful number, since it uses less digits than its factorization.

20047558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10023781.

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 20047558 is about 4477.4499438855. The cubic root of 20047558 is about 271.6567451347.

The spelling of 20047558 in words is "twenty million, forty-seven thousand, five hundred fifty-eight".