20505115330 has 32 divisors (see below), whose sum is σ = 42415027200. Its totient is φ = 6991479360.

The previous prime is 20505115307. The next prime is 20505115333. The reversal of 20505115330 is 3351150502.

It is a junction number, because it is equal to n+sod(n) for n = 20505115295 and 20505115304.

It is not an unprimeable number, because it can be changed into a prime (20505115333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 796530 + ... + 821869.

It is an arithmetic number, because the mean of its divisors is an integer number (1325469600).

Almost surely, 2^20505115330 is an apocalyptic number.

20505115330 is an abundant number, since it is smaller than the sum of its proper divisors (21909911870).

20505115330 is a wasteful number, since it uses less digits than its factorization.

20505115330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618594.

The product of its (nonzero) digits is 2250, while the sum is 25.

Adding to 20505115330 its reverse (3351150502), we get a palindrome (23856265832).

The spelling of 20505115330 in words is "twenty billion, five hundred five million, one hundred fifteen thousand, three hundred thirty".