20641493 has 2 divisors, whose sum is σ = 20641494. Its totient is φ = 20641492.

The previous prime is 20641483. The next prime is 20641513. The reversal of 20641493 is 39414602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14915044 + 5726449 = 3862^2 + 2393^2 .

It is a cyclic number.

It is not a de Polignac number, because 20641493 - 2¹⁰ = 20640469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20641403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320746 + 10320747.

It is an arithmetic number, because the mean of its divisors is an integer number (10320747).

Almost surely, 2^20641493 is an apocalyptic number.

It is an amenable number.

20641493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641493 is an equidigital number, since it uses as much as digits as its factorization.

20641493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20641493 is about 4543.2909878193. The cubic root of 20641493 is about 274.3134078742.

The spelling of 20641493 in words is "twenty million, six hundred forty-one thousand, four hundred ninety-three".