19680945 has 16 divisors (see below), whose sum is σ = 31596480. Its totient is φ = 10460864.

The previous prime is 19680923. The next prime is 19680953. The reversal of 19680945 is 54908691.

It is a cyclic number.

It is not a de Polignac number, because 19680945 - 2¹⁰ = 19679921 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19680897 and 19680906.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2686 + ... + 6824.

It is an arithmetic number, because the mean of its divisors is an integer number (1974780).

Almost surely, 2^19680945 is an apocalyptic number.

19680945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19680945 is a deficient number, since it is larger than the sum of its proper divisors (11915535).

19680945 is a wasteful number, since it uses less digits than its factorization.

19680945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4464.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 19680945 is about 4436.3211110108. The cubic root of 19680945 is about 269.9906032395.

The spelling of 19680945 in words is "nineteen million, six hundred eighty thousand, nine hundred forty-five".