20415133 has 2 divisors, whose sum is σ = 20415134. Its totient is φ = 20415132.

The previous prime is 20415119. The next prime is 20415149. The reversal of 20415133 is 33151402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20412324 + 2809 = 4518^2 + 53^2 .

It is a cyclic number.

It is not a de Polignac number, because 20415133 - 2⁹ = 20414621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20415133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20415103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10207566 + 10207567.

It is an arithmetic number, because the mean of its divisors is an integer number (10207567).

Almost surely, 2^20415133 is an apocalyptic number.

It is an amenable number.

20415133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20415133 is an equidigital number, since it uses as much as digits as its factorization.

20415133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20415133 is about 4518.3108569464. The cubic root of 20415133 is about 273.3069891657.

Adding to 20415133 its reverse (33151402), we get a palindrome (53566535).

The spelling of 20415133 in words is "twenty million, four hundred fifteen thousand, one hundred thirty-three".