20346116521 has 8 divisors (see below), whose sum is σ = 20553347360. Its totient is φ = 20139755328.

The previous prime is 20346116513. The next prime is 20346116533. The reversal of 20346116521 is 12561164302.

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 not a de Polignac number, because 20346116521 - 2³ = 20346116513 is a prime.

It is a super-2 number, since 2×20346116521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20346116551) 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, 170331 + ... + 264016.

It is an arithmetic number, because the mean of its divisors is an integer number (2569168420).

Almost surely, 2^20346116521 is an apocalyptic number.

It is an amenable number.

20346116521 is a deficient number, since it is larger than the sum of its proper divisors (207230839).

20346116521 is a wasteful number, since it uses less digits than its factorization.

20346116521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434823.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 20346116521 in words is "twenty billion, three hundred forty-six million, one hundred sixteen thousand, five hundred twenty-one".