20588863217 has 18 divisors (see below), whose sum is σ = 23614709058. Its totient is φ = 17880475392.

The previous prime is 20588863199. The next prime is 20588863237. The reversal of 20588863217 is 71236888502.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 18943668496 + 1645194721 = 137636^2 + 40561^2 .

It is not a de Polignac number, because 20588863217 - 2¹² = 20588859121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20588863237) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7689683 + ... + 7692359.

It is an arithmetic number, because the mean of its divisors is an integer number (1311928281).

Almost surely, 2^20588863217 is an apocalyptic number.

It is an amenable number.

20588863217 is a deficient number, since it is larger than the sum of its proper divisors (3025845841).

20588863217 is an frugal number, since it uses more digits than its factorization.

20588863217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5397 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 20588863217 in words is "twenty billion, five hundred eighty-eight million, eight hundred sixty-three thousand, two hundred seventeen".