20323661 has 2 divisors, whose sum is σ = 20323662. Its totient is φ = 20323660.

The previous prime is 20323657. The next prime is 20323669. The reversal of 20323661 is 16632302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14394436 + 5929225 = 3794^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 20323661 - 2² = 20323657 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20323669) 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 as a sum of consecutive naturals, namely, 10161830 + 10161831.

It is an arithmetic number, because the mean of its divisors is an integer number (10161831).

Almost surely, 2^20323661 is an apocalyptic number.

It is an amenable number.

20323661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323661 is an equidigital number, since it uses as much as digits as its factorization.

20323661 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 20323661 is about 4508.1771260677. The cubic root of 20323661 is about 272.8981850961.

Adding to 20323661 its reverse (16632302), we get a palindrome (36955963).

The spelling of 20323661 in words is "twenty million, three hundred twenty-three thousand, six hundred sixty-one".