19720433 has 8 divisors (see below), whose sum is σ = 20520960. Its totient is φ = 18930240.

The previous prime is 19720403. The next prime is 19720447. The reversal of 19720433 is 33402791.

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 19720433 - 2¹² = 19716337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19720396 and 19720405.

It is not an unprimeable number, because it can be changed into a prime (19720403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1433 + ... + 6441.

It is an arithmetic number, because the mean of its divisors is an integer number (2565120).

Almost surely, 2^19720433 is an apocalyptic number.

It is an amenable number.

19720433 is a deficient number, since it is larger than the sum of its proper divisors (800527).

19720433 is a wasteful number, since it uses less digits than its factorization.

19720433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5167.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 19720433 is about 4440.7694153153. The cubic root of 19720433 is about 270.1710530183.

The spelling of 19720433 in words is "nineteen million, seven hundred twenty thousand, four hundred thirty-three".