20415163 has 2 divisors, whose sum is σ = 20415164. Its totient is φ = 20415162.

The previous prime is 20415149. The next prime is 20415167. The reversal of 20415163 is 36151402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20415163 - 2²¹ = 18318011 is a prime.

It is not a weakly prime, because it can be changed into another prime (20415167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10207581 + 10207582.

It is an arithmetic number, because the mean of its divisors is an integer number (10207582).

Almost surely, 2^20415163 is an apocalyptic number.

20415163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20415163 is an equidigital number, since it uses as much as digits as its factorization.

20415163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20415163 is about 4518.3141767699. The cubic root of 20415163 is about 273.3071230403.

Adding to 20415163 its reverse (36151402), we get a palindrome (56566565).

The spelling of 20415163 in words is "twenty million, four hundred fifteen thousand, one hundred sixty-three".