20861716385 has 8 divisors (see below), whose sum is σ = 25616247360. Its totient is φ = 16301247984.

The previous prime is 20861716303. The next prime is 20861716397. The reversal of 20861716385 is 58361716802.

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 20861716385 - 2³⁴ = 3681847201 is a prime.

It is a super-2 number, since 2×20861716385² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48515405 + ... + 48515834.

It is an arithmetic number, because the mean of its divisors is an integer number (3202030920).

Almost surely, 2^20861716385 is an apocalyptic number.

It is an amenable number.

20861716385 is a deficient number, since it is larger than the sum of its proper divisors (4754530975).

20861716385 is an equidigital number, since it uses as much as digits as its factorization.

20861716385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97031287.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 20861716385 in words is "twenty billion, eight hundred sixty-one million, seven hundred sixteen thousand, three hundred eighty-five".