19805530 has 16 divisors (see below), whose sum is σ = 37200384. Its totient is φ = 7577680.

The previous prime is 19805519. The next prime is 19805531. The reversal of 19805530 is 3550891.

It is a junction number, because it is equal to n+sod(n) for n = 19805492 and 19805501.

It is not an unprimeable number, because it can be changed into a prime (19805531) 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 7 ways as a sum of consecutive naturals, for example, 42826 + ... + 43285.

It is an arithmetic number, because the mean of its divisors is an integer number (2325024).

Almost surely, 2^19805530 is an apocalyptic number.

19805530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19805530 is a deficient number, since it is larger than the sum of its proper divisors (17394854).

19805530 is a wasteful number, since it uses less digits than its factorization.

19805530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86141.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 19805530 is about 4450.3404364161. The cubic root of 19805530 is about 270.5591066257.

The spelling of 19805530 in words is "nineteen million, eight hundred five thousand, five hundred thirty".