19955505 has 16 divisors (see below), whose sum is σ = 31993920. Its totient is φ = 10621248.

The previous prime is 19955497. The next prime is 19955539. The reversal of 19955505 is 50555991.

It is a happy number.

It is not a de Polignac number, because 19955505 - 2³ = 19955497 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 8611 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (1999620).

Almost surely, 2^19955505 is an apocalyptic number.

19955505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19955505 is a deficient number, since it is larger than the sum of its proper divisors (12038415).

19955505 is a wasteful number, since it uses less digits than its factorization.

19955505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2720.

The product of its (nonzero) digits is 50625, while the sum is 39.

The square root of 19955505 is about 4467.1584928229. The cubic root of 19955505 is about 271.2403155100.

The spelling of 19955505 in words is "nineteen million, nine hundred fifty-five thousand, five hundred five".