20331097 has 4 divisors (see below), whose sum is σ = 20341476. Its totient is φ = 20320720.

The previous prime is 20331079. The next prime is 20331107. The reversal of 20331097 is 79013302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16736281 + 3594816 = 4091^2 + 1896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20331097 is a prime.

It is a super-4 number, since 4×20331097⁴ (a number of 30 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20335097) 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 3 ways as a sum of consecutive naturals, for example, 1258 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (5085369).

Almost surely, 2^20331097 is an apocalyptic number.

It is an amenable number.

20331097 is a deficient number, since it is larger than the sum of its proper divisors (10379).

20331097 is an equidigital number, since it uses as much as digits as its factorization.

20331097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10378.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 20331097 is about 4509.0017742290. The cubic root of 20331097 is about 272.9314636060.

Adding to 20331097 its reverse (79013302), we get a palindrome (99344399).

The spelling of 20331097 in words is "twenty million, three hundred thirty-one thousand, ninety-seven".