20382997 has 4 divisors (see below), whose sum is σ = 20531916. Its totient is φ = 20234080.

The previous prime is 20382961. The next prime is 20383009. The reversal of 20382997 is 79928302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79928302 = 2 ⋅39964151.

It can be written as a sum of positive squares in 2 ways, for example, as 13205956 + 7177041 = 3634^2 + 2679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20382997 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20382917) 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 in 3 ways as a sum of consecutive naturals, for example, 74254 + ... + 74527.

It is an arithmetic number, because the mean of its divisors is an integer number (5132979).

Almost surely, 2^20382997 is an apocalyptic number.

It is an amenable number.

20382997 is a deficient number, since it is larger than the sum of its proper divisors (148919).

20382997 is a wasteful number, since it uses less digits than its factorization.

20382997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148918.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 20382997 is about 4514.7532601461. The cubic root of 20382997 is about 273.1635072700.

The spelling of 20382997 in words is "twenty million, three hundred eighty-two thousand, nine hundred ninety-seven".