20332661 has 2 divisors, whose sum is σ = 20332662. Its totient is φ = 20332660.

The previous prime is 20332657. The next prime is 20332693. The reversal of 20332661 is 16623302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20295025 + 37636 = 4505^2 + 194^2 .

It is a cyclic number.

It is not a de Polignac number, because 20332661 - 2² = 20332657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20332651) 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, 10166330 + 10166331.

It is an arithmetic number, because the mean of its divisors is an integer number (10166331).

Almost surely, 2^20332661 is an apocalyptic number.

It is an amenable number.

20332661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20332661 is an equidigital number, since it uses as much as digits as its factorization.

20332661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20332661 is about 4509.1752017414. The cubic root of 20332661 is about 272.9384619801.

Adding to 20332661 its reverse (16623302), we get a palindrome (36955963).

The spelling of 20332661 in words is "twenty million, three hundred thirty-two thousand, six hundred sixty-one".