19806545 has 16 divisors (see below), whose sum is σ = 26136000. Its totient is φ = 14289600.

The previous prime is 19806503. The next prime is 19806557. The reversal of 19806545 is 54560891.

It is not a de Polignac number, because 19806545 - 2⁶ = 19806481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19806499 and 19806508.

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, 5831 + ... + 8579.

It is an arithmetic number, because the mean of its divisors is an integer number (1633500).

Almost surely, 2^19806545 is an apocalyptic number.

It is an amenable number.

19806545 is a deficient number, since it is larger than the sum of its proper divisors (6329455).

19806545 is a wasteful number, since it uses less digits than its factorization.

19806545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 19806545 is about 4450.4544711748. The cubic root of 19806545 is about 270.5637284460.

The spelling of 19806545 in words is "nineteen million, eight hundred six thousand, five hundred forty-five".