19930555 has 4 divisors (see below), whose sum is σ = 23916672. Its totient is φ = 15944440.

The previous prime is 19930549. The next prime is 19930567. The reversal of 19930555 is 55503991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55503991 = 23 ⋅2413217.

It is not a de Polignac number, because 19930555 - 2⁵ = 19930523 is a prime.

It is a Duffinian 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 in 3 ways as a sum of consecutive naturals, for example, 1993051 + ... + 1993060.

It is an arithmetic number, because the mean of its divisors is an integer number (5979168).

Almost surely, 2^19930555 is an apocalyptic number.

19930555 is a deficient number, since it is larger than the sum of its proper divisors (3986117).

19930555 is an equidigital number, since it uses as much as digits as its factorization.

19930555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986116.

The product of its (nonzero) digits is 30375, while the sum is 37.

The square root of 19930555 is about 4464.3650164385. The cubic root of 19930555 is about 271.1272261104.

The spelling of 19930555 in words is "nineteen million, nine hundred thirty thousand, five hundred fifty-five".