19955816 has 32 divisors (see below), whose sum is σ = 39233280. Its totient is φ = 9504000.

The previous prime is 19955809. The next prime is 19955843. The reversal of 19955816 is 61855991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16016 + ... + 17216.

It is an arithmetic number, because the mean of its divisors is an integer number (1226040).

Almost surely, 2^19955816 is an apocalyptic number.

It is an amenable number.

19955816 is a deficient number, since it is larger than the sum of its proper divisors (19277464).

19955816 is a wasteful number, since it uses less digits than its factorization.

19955816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305 (or 1301 counting only the distinct ones).

The product of its digits is 97200, while the sum is 44.

The square root of 19955816 is about 4467.1933022872. The cubic root of 19955816 is about 271.2417245665.

The spelling of 19955816 in words is "nineteen million, nine hundred fifty-five thousand, eight hundred sixteen".