20415413 has 4 divisors (see below), whose sum is σ = 20439468. Its totient is φ = 20391360.

The previous prime is 20415401. The next prime is 20415431. The reversal of 20415413 is 31451402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31451402 = 2 ⋅15725701.

It can be written as a sum of positive squares in 2 ways, for example, as 1423249 + 18992164 = 1193^2 + 4358^2 .

It is a cyclic number.

It is not a de Polignac number, because 20415413 - 2⁴ = 20415397 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 (20415463) 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, 10706 + ... + 12467.

It is an arithmetic number, because the mean of its divisors is an integer number (5109867).

Almost surely, 2^20415413 is an apocalyptic number.

It is an amenable number.

20415413 is a deficient number, since it is larger than the sum of its proper divisors (24055).

20415413 is an equidigital number, since it uses as much as digits as its factorization.

20415413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24054.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20415413 is about 4518.3418418708. The cubic root of 20415413 is about 273.3082386572.

Adding to 20415413 its reverse (31451402), we get a palindrome (51866815).

The spelling of 20415413 in words is "twenty million, four hundred fifteen thousand, four hundred thirteen".