20320637217 has 8 divisors (see below), whose sum is σ = 28687958496. Its totient is φ = 12750203712.

The previous prime is 20320637191. The next prime is 20320637257. The reversal of 20320637217 is 71273602302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20320637217 - 2⁶ = 20320637153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20320637257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199221883 + ... + 199221984.

It is an arithmetic number, because the mean of its divisors is an integer number (3585994812).

Almost surely, 2^20320637217 is an apocalyptic number.

It is an amenable number.

20320637217 is a deficient number, since it is larger than the sum of its proper divisors (8367321279).

20320637217 is a wasteful number, since it uses less digits than its factorization.

20320637217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398443887.

The product of its (nonzero) digits is 21168, while the sum is 33.

The spelling of 20320637217 in words is "twenty billion, three hundred twenty million, six hundred thirty-seven thousand, two hundred seventeen".