20846317155 has 24 divisors (see below), whose sum is σ = 33456004176. Its totient is φ = 11084103360.

The previous prime is 20846317111. The next prime is 20846317159. The reversal of 20846317155 is 55171364802.

It is a happy number.

It is not a de Polignac number, because 20846317155 - 2¹⁴ = 20846300771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20846317159) 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 23 ways as a sum of consecutive naturals, for example, 11140870 + ... + 11142740.

It is an arithmetic number, because the mean of its divisors is an integer number (1394000174).

Almost surely, 2^20846317155 is an apocalyptic number.

20846317155 is a deficient number, since it is larger than the sum of its proper divisors (12609687021).

20846317155 is an frugal number, since it uses more digits than its factorization.

20846317155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4147 (or 2276 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 20846317155 in words is "twenty billion, eight hundred forty-six million, three hundred seventeen thousand, one hundred fifty-five".