19886045 has 4 divisors (see below), whose sum is σ = 23863260. Its totient is φ = 15908832.

The previous prime is 19886023. The next prime is 19886047. The reversal of 19886045 is 54068891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54068891 = 17 ⋅3180523.

It can be written as a sum of positive squares in 2 ways, for example, as 6911641 + 12974404 = 2629^2 + 3602^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19886045 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19885993 and 19886011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19886047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1988600 + ... + 1988609.

It is an arithmetic number, because the mean of its divisors is an integer number (5965815).

Almost surely, 2^19886045 is an apocalyptic number.

It is an amenable number.

19886045 is a deficient number, since it is larger than the sum of its proper divisors (3977215).

19886045 is an equidigital number, since it uses as much as digits as its factorization.

19886045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977214.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 19886045 is about 4459.3771986680. The cubic root of 19886045 is about 270.9252436512.

The spelling of 19886045 in words is "nineteen million, eight hundred eighty-six thousand, forty-five".