20817348946 has 16 divisors (see below), whose sum is σ = 33766315776. Its totient is φ = 9587964736.

The previous prime is 20817348943. The next prime is 20817348973. The reversal of 20817348946 is 64984371802.

It is a junction number, because it is equal to n+sod(n) for n = 20817348893 and 20817348902.

It is not an unprimeable number, because it can be changed into a prime (20817348943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6511966 + ... + 6515161.

It is an arithmetic number, because the mean of its divisors is an integer number (2110394736).

Almost surely, 2^20817348946 is an apocalyptic number.

20817348946 is a deficient number, since it is larger than the sum of its proper divisors (12948966830).

20817348946 is a wasteful number, since it uses less digits than its factorization.

20817348946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13027193.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 20817348946 in words is "twenty billion, eight hundred seventeen million, three hundred forty-eight thousand, nine hundred forty-six".