19845545 has 8 divisors (see below), whose sum is σ = 25215624. Its totient is φ = 14942464.

The previous prime is 19845533. The next prime is 19845547. The reversal of 19845545 is 54554891.

It can be written as a sum of positive squares in 4 ways, for example, as 9554281 + 10291264 = 3091^2 + 3208^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19845545 - 2¹² = 19841449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19845547) 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, 116654 + ... + 116823.

It is an arithmetic number, because the mean of its divisors is an integer number (3151953).

Almost surely, 2^19845545 is an apocalyptic number.

It is an amenable number.

19845545 is a deficient number, since it is larger than the sum of its proper divisors (5370079).

19845545 is a wasteful number, since it uses less digits than its factorization.

19845545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233499.

The product of its digits is 144000, while the sum is 41.

The square root of 19845545 is about 4454.8338914038. The cubic root of 19845545 is about 270.7411961668.

The spelling of 19845545 in words is "nineteen million, eight hundred forty-five thousand, five hundred forty-five".