20955314817 has 16 divisors (see below), whose sum is σ = 31047381760. Its totient is φ = 13969098000.

The previous prime is 20955314801. The next prime is 20955314819. The reversal of 20955314817 is 71841355902.

20955314817 is a `hidden beast` number, since 2 + 0 + 9 + 553 + 14 + 81 + 7 = 666.

It is not a de Polignac number, because 20955314817 - 2⁴ = 20955314801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20955314819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 451767 + ... + 495987.

It is an arithmetic number, because the mean of its divisors is an integer number (1940461360).

Almost surely, 2^20955314817 is an apocalyptic number.

20955314817 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20955314817 is a deficient number, since it is larger than the sum of its proper divisors (10092066943).

20955314817 is a wasteful number, since it uses less digits than its factorization.

20955314817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61781 (or 61775 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 20955314817 in words is "twenty billion, nine hundred fifty-five million, three hundred fourteen thousand, eight hundred seventeen".