19780545 has 8 divisors (see below), whose sum is σ = 31648896. Its totient is φ = 10549616.

The previous prime is 19780513. The next prime is 19780549. The reversal of 19780545 is 54508791.

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 19780545 - 2⁵ = 19780513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19780549) 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, 659337 + ... + 659366.

It is an arithmetic number, because the mean of its divisors is an integer number (3956112).

Almost surely, 2^19780545 is an apocalyptic number.

19780545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19780545 is a deficient number, since it is larger than the sum of its proper divisors (11868351).

19780545 is a wasteful number, since it uses less digits than its factorization.

19780545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318711.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 19780545 is about 4447.5324619389. The cubic root of 19780545 is about 270.4452871713.

The spelling of 19780545 in words is "nineteen million, seven hundred eighty thousand, five hundred forty-five".