19720149 has 16 divisors (see below), whose sum is σ = 27287040. Its totient is φ = 12657600.

The previous prime is 19720133. The next prime is 19720159. The reversal of 19720149 is 94102791.

It is not a de Polignac number, because 19720149 - 2⁴ = 19720133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19720159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10332 + ... + 12090.

It is an arithmetic number, because the mean of its divisors is an integer number (1705440).

Almost surely, 2^19720149 is an apocalyptic number.

It is an amenable number.

19720149 is a deficient number, since it is larger than the sum of its proper divisors (7566891).

19720149 is a wasteful number, since it uses less digits than its factorization.

19720149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1900.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 19720149 is about 4440.7374387595. The cubic root of 19720149 is about 270.1697560733.

The spelling of 19720149 in words is "nineteen million, seven hundred twenty thousand, one hundred forty-nine".