19997316 has 36 divisors (see below), whose sum is σ = 51918412. Its totient is φ = 6485184.

The previous prime is 19997297. The next prime is 19997317. The reversal of 19997316 is 61379991.

It can be written as a sum of positive squares in 2 ways, for example, as 16402500 + 3594816 = 4050^2 + 1896^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (19997317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6175 + ... + 8838.

Almost surely, 2^19997316 is an apocalyptic number.

It is an amenable number.

19997316 is an abundant number, since it is smaller than the sum of its proper divisors (31921096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19997316 is a wasteful number, since it uses less digits than its factorization.

19997316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15060 (or 15055 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 19997316 is about 4471.8358646086. The cubic root of 19997316 is about 271.4296186215.

The spelling of 19997316 in words is "nineteen million, nine hundred ninety-seven thousand, three hundred sixteen".