20341661 has 2 divisors, whose sum is σ = 20341662. Its totient is φ = 20341660.

The previous prime is 20341649. The next prime is 20341667. The reversal of 20341661 is 16614302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 2785561 = 4190^2 + 1669^2 .

It is a cyclic number.

It is not a de Polignac number, because 20341661 - 2¹⁰ = 20340637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20341667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10170830 + 10170831.

It is an arithmetic number, because the mean of its divisors is an integer number (10170831).

Almost surely, 2^20341661 is an apocalyptic number.

It is an amenable number.

20341661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20341661 is an equidigital number, since it uses as much as digits as its factorization.

20341661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20341661 is about 4510.1730565467. The cubic root of 20341661 is about 272.9787269805.

Adding to 20341661 its reverse (16614302), we get a palindrome (36955963).

The spelling of 20341661 in words is "twenty million, three hundred forty-one thousand, six hundred sixty-one".