20415005 has 8 divisors (see below), whose sum is σ = 26382552. Its totient is φ = 15075648.

The previous prime is 20414993. The next prime is 20415013. The reversal of 20415005 is 50051402.

20415005 = 330² + 331² + ... + 459².

It can be written as a sum of positive squares in 4 ways, for example, as 38809 + 20376196 = 197^2 + 4514^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20415005 - 2¹⁸ = 20152861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156974 + ... + 157103.

It is an arithmetic number, because the mean of its divisors is an integer number (3297819).

Almost surely, 2^20415005 is an apocalyptic number.

It is an amenable number.

20415005 is a deficient number, since it is larger than the sum of its proper divisors (5967547).

20415005 is a wasteful number, since it uses less digits than its factorization.

20415005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314095.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 20415005 is about 4518.2966923388. The cubic root of 20415005 is about 273.3064179657.

Adding to 20415005 its reverse (50051402), we get a palindrome (70466407).

The spelling of 20415005 in words is "twenty million, four hundred fifteen thousand, five".