20846607187 has 12 divisors (see below), whose sum is σ = 25676614440. Its totient is φ = 16817430336.

The previous prime is 20846607181. The next prime is 20846607191. The reversal of 20846607187 is 78170664802.

It is a happy number.

It is not a de Polignac number, because 20846607187 - 2¹⁹ = 20846082899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20846607187.

It is not an unprimeable number, because it can be changed into a prime (20846607181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12512137 + ... + 12513802.

It is an arithmetic number, because the mean of its divisors is an integer number (2139717870).

Almost surely, 2^20846607187 is an apocalyptic number.

20846607187 is a deficient number, since it is larger than the sum of its proper divisors (4830007253).

20846607187 is a wasteful number, since it uses less digits than its factorization.

20846607187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25025970 (or 25025963 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 49.

The spelling of 20846607187 in words is "twenty billion, eight hundred forty-six million, six hundred seven thousand, one hundred eighty-seven".