19973306 has 4 divisors (see below), whose sum is σ = 29959962. Its totient is φ = 9986652.

The previous prime is 19973297. The next prime is 19973309. The reversal of 19973306 is 60337991.

19973306 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60337991 = 7 ⋅8619713.

It can be written as a sum of positive squares in only one way, i.e., 10725625 + 9247681 = 3275^2 + 3041^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19973306.

It is not an unprimeable number, because it can be changed into a prime (19973309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993325 + ... + 4993328.

Almost surely, 2^19973306 is an apocalyptic number.

19973306 is a deficient number, since it is larger than the sum of its proper divisors (9986656).

19973306 is an equidigital number, since it uses as much as digits as its factorization.

19973306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9986655.

The product of its (nonzero) digits is 30618, while the sum is 38.

The square root of 19973306 is about 4469.1504785585. The cubic root of 19973306 is about 271.3209434518.

The spelling of 19973306 in words is "nineteen million, nine hundred seventy-three thousand, three hundred six".