20530415 has 4 divisors (see below), whose sum is σ = 24636504. Its totient is φ = 16424328.

The previous prime is 20530397. The next prime is 20530417. The reversal of 20530415 is 51403502.

20530415 = T₁₆₄₇ + T₁₆₄₈ + ... + T₁₆₆₁.

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

It is a cyclic number.

It is not a de Polignac number, because 20530415 - 2⁶ = 20530351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20530417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2053037 + ... + 2053046.

It is an arithmetic number, because the mean of its divisors is an integer number (6159126).

Almost surely, 2^20530415 is an apocalyptic number.

20530415 is a deficient number, since it is larger than the sum of its proper divisors (4106089).

20530415 is an equidigital number, since it uses as much as digits as its factorization.

20530415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106088.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20530415 is about 4531.0500990389. The cubic root of 20530415 is about 273.8204686428.

Adding to 20530415 its reverse (51403502), we get a palindrome (71933917).

The spelling of 20530415 in words is "twenty million, five hundred thirty thousand, four hundred fifteen".