20415115 has 24 divisors (see below), whose sum is σ = 28810080. Its totient is φ = 13845888.

The previous prime is 20415103. The next prime is 20415119. The reversal of 20415115 is 51151402.

It is not a de Polignac number, because 20415115 - 2²³ = 12026507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20415092 and 20415101.

It is not an unprimeable number, because it can be changed into a prime (20415119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24831 + ... + 25639.

It is an arithmetic number, because the mean of its divisors is an integer number (1200420).

Almost surely, 2^20415115 is an apocalyptic number.

20415115 is a deficient number, since it is larger than the sum of its proper divisors (8394965).

20415115 is a wasteful number, since it uses less digits than its factorization.

20415115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 20415115 is about 4518.3088650512. The cubic root of 20415115 is about 273.3069088408.

Adding to 20415115 its reverse (51151402), we get a palindrome (71566517).

The spelling of 20415115 in words is "twenty million, four hundred fifteen thousand, one hundred fifteen".