20089661 has 2 divisors, whose sum is σ = 20089662. Its totient is φ = 20089660.

The previous prime is 20089651. The next prime is 20089687. The reversal of 20089661 is 16698002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 1651225 = 4294^2 + 1285^2 .

It is a cyclic number.

It is not a de Polignac number, because 20089661 - 2¹⁸ = 19827517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20089651) 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, 10044830 + 10044831.

It is an arithmetic number, because the mean of its divisors is an integer number (10044831).

Almost surely, 2^20089661 is an apocalyptic number.

It is an amenable number.

20089661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20089661 is an equidigital number, since it uses as much as digits as its factorization.

20089661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 20089661 is about 4482.1491496825. The cubic root of 20089661 is about 271.8467860095.

The spelling of 20089661 in words is "twenty million, eighty-nine thousand, six hundred sixty-one".