20415015 has 12 divisors (see below), whose sum is σ = 35386104. Its totient is φ = 10887984.

The previous prime is 20415013. The next prime is 20415037. The reversal of 20415015 is 51051402.

It is not a de Polignac number, because 20415015 - 2¹ = 20415013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226789 + ... + 226878.

It is an arithmetic number, because the mean of its divisors is an integer number (2948842).

Almost surely, 2^20415015 is an apocalyptic number.

20415015 is a deficient number, since it is larger than the sum of its proper divisors (14971089).

20415015 is a wasteful number, since it uses less digits than its factorization.

20415015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453678 (or 453675 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 20415015 is about 4518.2977989504. The cubic root of 20415015 is about 273.3064625908.

Adding to 20415015 its reverse (51051402), we get a palindrome (71466417).

It can be divided in two parts, 2041 and 5015, that added together give a square (7056 = 84²).

The spelling of 20415015 in words is "twenty million, four hundred fifteen thousand, fifteen".