19995550 has 12 divisors (see below), whose sum is σ = 37191816. Its totient is φ = 7998200.

The previous prime is 19995523. The next prime is 19995551. The reversal of 19995550 is 5559991.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19995497 and 19995506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19995551) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 199906 + ... + 200005.

It is an arithmetic number, because the mean of its divisors is an integer number (3099318).

Almost surely, 2^19995550 is an apocalyptic number.

19995550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19995550 is a deficient number, since it is larger than the sum of its proper divisors (17196266).

19995550 is a wasteful number, since it uses less digits than its factorization.

19995550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399923 (or 399918 counting only the distinct ones).

The product of its (nonzero) digits is 91125, while the sum is 43.

The square root of 19995550 is about 4471.6384021967. The cubic root of 19995550 is about 271.4216282355.

The spelling of 19995550 in words is "nineteen million, nine hundred ninety-five thousand, five hundred fifty".