20820336187 has 8 divisors (see below), whose sum is σ = 23845625856. Its totient is φ = 17807785512.

The previous prime is 20820336151. The next prime is 20820336191. The reversal of 20820336187 is 78163302802.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20820336187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20820336137) 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, 3181243 + ... + 3187780.

It is an arithmetic number, because the mean of its divisors is an integer number (2980703232).

Almost surely, 2^20820336187 is an apocalyptic number.

20820336187 is a deficient number, since it is larger than the sum of its proper divisors (3025289669).

20820336187 is an equidigital number, since it uses as much as digits as its factorization.

20820336187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6369497.

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 20820336187 its reverse (78163302802), we get a palindrome (98983638989).

The spelling of 20820336187 in words is "twenty billion, eight hundred twenty million, three hundred thirty-six thousand, one hundred eighty-seven".