20315438066 has 32 divisors (see below), whose sum is σ = 38007982080. Its totient is φ = 7911882000.

The previous prime is 20315438027. The next prime is 20315438069. The reversal of 20315438066 is 66083451302.

It is not an unprimeable number, because it can be changed into a prime (20315438069) 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, 371591 + ... + 422741.

It is an arithmetic number, because the mean of its divisors is an integer number (1187749440).

Almost surely, 2^20315438066 is an apocalyptic number.

20315438066 is a deficient number, since it is larger than the sum of its proper divisors (17692544014).

20315438066 is a wasteful number, since it uses less digits than its factorization.

20315438066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53750.

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 20315438066 its reverse (66083451302), we get a palindrome (86398889368).

The spelling of 20315438066 in words is "twenty billion, three hundred fifteen million, four hundred thirty-eight thousand, sixty-six".