20205104115 has 64 divisors (see below), whose sum is σ = 38567531520. Its totient is φ = 8839549440.

The previous prime is 20205104113. The next prime is 20205104131. The reversal of 20205104115 is 51140150202.

It is not a de Polignac number, because 20205104115 - 2¹ = 20205104113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20205104091 and 20205104100.

It is not an unprimeable number, because it can be changed into a prime (20205104113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 194356 + ... + 279614.

It is an arithmetic number, because the mean of its divisors is an integer number (602617680).

Almost surely, 2^20205104115 is an apocalyptic number.

20205104115 is a deficient number, since it is larger than the sum of its proper divisors (18362427405).

20205104115 is a wasteful number, since it uses less digits than its factorization.

20205104115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85372.

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 20205104115 its reverse (51140150202), we get a palindrome (71345254317).

The spelling of 20205104115 in words is "twenty billion, two hundred five million, one hundred four thousand, one hundred fifteen".