20205115 has 16 divisors (see below), whose sum is σ = 27893952. Its totient is φ = 13762944.

The previous prime is 20205103. The next prime is 20205121. The reversal of 20205115 is 51150202.

It is a cyclic number.

It is not a de Polignac number, because 20205115 - 2¹³ = 20196923 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3657 + ... + 7333.

It is an arithmetic number, because the mean of its divisors is an integer number (1743372).

Almost surely, 2^20205115 is an apocalyptic number.

20205115 is a deficient number, since it is larger than the sum of its proper divisors (7688837).

20205115 is a wasteful number, since it uses less digits than its factorization.

20205115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 20205115 is about 4495.0100111123. The cubic root of 20205115 is about 272.3665536319.

Adding to 20205115 its reverse (51150202), we get a palindrome (71355317).

The spelling of 20205115 in words is "twenty million, two hundred five thousand, one hundred fifteen".