20485575217 has 8 divisors (see below), whose sum is σ = 21164343552. Its totient is φ = 19807928400.

The previous prime is 20485575199. The next prime is 20485575233. The reversal of 20485575217 is 71257558402.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20485575217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20485575917) 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, 243163 + ... + 316384.

It is an arithmetic number, because the mean of its divisors is an integer number (2645542944).

Almost surely, 2^20485575217 is an apocalyptic number.

It is an amenable number.

20485575217 is a deficient number, since it is larger than the sum of its proper divisors (678768335).

20485575217 is a wasteful number, since it uses less digits than its factorization.

20485575217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560759.

The product of its (nonzero) digits is 784000, while the sum is 46.

The spelling of 20485575217 in words is "twenty billion, four hundred eighty-five million, five hundred seventy-five thousand, two hundred seventeen".