20471663 has 2 divisors, whose sum is σ = 20471664. Its totient is φ = 20471662.

The previous prime is 20471639. The next prime is 20471699. The reversal of 20471663 is 36617402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20471663 - 2⁶ = 20471599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20471603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10235831 + 10235832.

It is an arithmetic number, because the mean of its divisors is an integer number (10235832).

Almost surely, 2^20471663 is an apocalyptic number.

20471663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20471663 is an equidigital number, since it uses as much as digits as its factorization.

20471663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 20471663 is about 4524.5621887648. The cubic root of 20471663 is about 273.5590212486.

The spelling of 20471663 in words is "twenty million, four hundred seventy-one thousand, six hundred sixty-three".