20215335617 has 8 divisors (see below), whose sum is σ = 20407827456. Its totient is φ = 20023364592.

The previous prime is 20215335607. The next prime is 20215335643. The reversal of 20215335617 is 71653351202.

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

It is a cyclic number.

It is not a de Polignac number, because 20215335617 - 2¹⁴ = 20215319233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20215335607) 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 7 ways as a sum of consecutive naturals, for example, 51983 + ... + 207684.

It is an arithmetic number, because the mean of its divisors is an integer number (2550978432).

Almost surely, 2^20215335617 is an apocalyptic number.

It is an amenable number.

20215335617 is a deficient number, since it is larger than the sum of its proper divisors (192491839).

20215335617 is a wasteful number, since it uses less digits than its factorization.

20215335617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260407.

The product of its (nonzero) digits is 37800, while the sum is 35.

Adding to 20215335617 its reverse (71653351202), we get a palindrome (91868686819).

The spelling of 20215335617 in words is "twenty billion, two hundred fifteen million, three hundred thirty-five thousand, six hundred seventeen".