20641727 has 2 divisors, whose sum is σ = 20641728. Its totient is φ = 20641726.

The previous prime is 20641721. The next prime is 20641739. The reversal of 20641727 is 72714602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20641727 - 2²⁰ = 19593151 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20641727.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20641721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10320863 + 10320864.

It is an arithmetic number, because the mean of its divisors is an integer number (10320864).

Almost surely, 2^20641727 is an apocalyptic number.

20641727 is a deficient number, since it is larger than the sum of its proper divisors (1).

20641727 is an equidigital number, since it uses as much as digits as its factorization.

20641727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 20641727 is about 4543.3167400039. The cubic root of 20641727 is about 274.3144444448.

The spelling of 20641727 in words is "twenty million, six hundred forty-one thousand, seven hundred twenty-seven".