20471747 has 2 divisors, whose sum is σ = 20471748. Its totient is φ = 20471746.

The previous prime is 20471719. The next prime is 20471777. The reversal of 20471747 is 74717402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20471747 - 2¹⁴ = 20455363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20471777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10235873 + 10235874.

It is an arithmetic number, because the mean of its divisors is an integer number (10235874).

Almost surely, 2^20471747 is an apocalyptic number.

20471747 is a deficient number, since it is larger than the sum of its proper divisors (1).

20471747 is an equidigital number, since it uses as much as digits as its factorization.

20471747 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10976, while the sum is 32.

The square root of 20471747 is about 4524.5714714214. The cubic root of 20471747 is about 273.5593954069.

The spelling of 20471747 in words is "twenty million, four hundred seventy-one thousand, seven hundred forty-seven".