20656415191 has 8 divisors (see below), whose sum is σ = 21512124000. Its totient is φ = 19810267680.

The previous prime is 20656415189. The next prime is 20656415201. The reversal of 20656415191 is 19151465602.

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 20656415191 - 2¹ = 20656415189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20656415141) 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, 2385915 + ... + 2394556.

It is an arithmetic number, because the mean of its divisors is an integer number (2689015500).

Almost surely, 2^20656415191 is an apocalyptic number.

20656415191 is a deficient number, since it is larger than the sum of its proper divisors (855708809).

20656415191 is a wasteful number, since it uses less digits than its factorization.

20656415191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780649.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 20656415191 in words is "twenty billion, six hundred fifty-six million, four hundred fifteen thousand, one hundred ninety-one".