20415361 has 4 divisors (see below), whose sum is σ = 20485332. Its totient is φ = 20345392.

The previous prime is 20415359. The next prime is 20415383. The reversal of 20415361 is 16351402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8643600 + 11771761 = 2940^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 20415361 - 2¹ = 20415359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20415301) 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 in 3 ways as a sum of consecutive naturals, for example, 34546 + ... + 35131.

It is an arithmetic number, because the mean of its divisors is an integer number (5121333).

Almost surely, 2^20415361 is an apocalyptic number.

It is an amenable number.

20415361 is a deficient number, since it is larger than the sum of its proper divisors (69971).

20415361 is an equidigital number, since it uses as much as digits as its factorization.

20415361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69970.

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

The square root of 20415361 is about 4518.3360875437. The cubic root of 20415361 is about 273.3080066096.

Adding to 20415361 its reverse (16351402), we get a palindrome (36766763).

The spelling of 20415361 in words is "twenty million, four hundred fifteen thousand, three hundred sixty-one".