19997482 has 4 divisors (see below), whose sum is σ = 29996226. Its totient is φ = 9998740.

The previous prime is 19997477. The next prime is 19997489. The reversal of 19997482 is 28479991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18913801 + 1083681 = 4349^2 + 1041^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (19997489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999369 + ... + 4999372.

Almost surely, 2^19997482 is an apocalyptic number.

19997482 is a deficient number, since it is larger than the sum of its proper divisors (9998744).

19997482 is an equidigital number, since it uses as much as digits as its factorization.

19997482 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9998743.

The product of its digits is 326592, while the sum is 49.

The square root of 19997482 is about 4471.8544251798. The cubic root of 19997482 is about 271.4303696755.

The spelling of 19997482 in words is "nineteen million, nine hundred ninety-seven thousand, four hundred eighty-two".