19720849 has 8 divisors (see below), whose sum is σ = 20165760. Its totient is φ = 19280976.

The previous prime is 19720843. The next prime is 19720853. The reversal of 19720849 is 94802791.

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 19720849 - 2¹⁹ = 19196561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19720843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7287 + ... + 9619.

It is an arithmetic number, because the mean of its divisors is an integer number (2520720).

Almost surely, 2^19720849 is an apocalyptic number.

It is an amenable number.

19720849 is a deficient number, since it is larger than the sum of its proper divisors (444911).

19720849 is a wasteful number, since it uses less digits than its factorization.

19720849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2519.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 19720849 is about 4440.8162537984. The cubic root of 19720849 is about 270.1729527461.

The spelling of 19720849 in words is "nineteen million, seven hundred twenty thousand, eight hundred forty-nine".