20415013 has 2 divisors, whose sum is σ = 20415014. Its totient is φ = 20415012.

The previous prime is 20414993. The next prime is 20415037. The reversal of 20415013 is 31051402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16793604 + 3621409 = 4098^2 + 1903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20415013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20415313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10207506 + 10207507.

It is an arithmetic number, because the mean of its divisors is an integer number (10207507).

Almost surely, 2^20415013 is an apocalyptic number.

It is an amenable number.

20415013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20415013 is an equidigital number, since it uses as much as digits as its factorization.

20415013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20415013 is about 4518.2975776281. The cubic root of 20415013 is about 273.3064536658.

Adding to 20415013 its reverse (31051402), we get a palindrome (51466415).

The spelling of 20415013 in words is "twenty million, four hundred fifteen thousand, thirteen".