19985554 has 4 divisors (see below), whose sum is σ = 29978334. Its totient is φ = 9992776.

The previous prime is 19985543. The next prime is 19985579. The reversal of 19985554 is 45558991.

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

It can be written as a sum of positive squares in only one way, i.e., 19758025 + 227529 = 4445^2 + 477^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4996387 + ... + 4996390.

Almost surely, 2^19985554 is an apocalyptic number.

19985554 is a deficient number, since it is larger than the sum of its proper divisors (9992780).

19985554 is an equidigital number, since it uses as much as digits as its factorization.

19985554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9992779.

The product of its digits is 324000, while the sum is 46.

The square root of 19985554 is about 4470.5205513452. The cubic root of 19985554 is about 271.3763917899.

The spelling of 19985554 in words is "nineteen million, nine hundred eighty-five thousand, five hundred fifty-four".