20001180391 has 16 divisors (see below), whose sum is σ = 22012197984. Its totient is φ = 18095145984.

The previous prime is 20001180341. The next prime is 20001180431. The reversal of 20001180391 is 19308110002.

It is not a de Polignac number, because 20001180391 - 2¹⁵ = 20001147623 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 (20001180341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139350 + ... + 243763.

It is an arithmetic number, because the mean of its divisors is an integer number (1375762374).

Almost surely, 2^20001180391 is an apocalyptic number.

20001180391 is a deficient number, since it is larger than the sum of its proper divisors (2011017593).

20001180391 is a wasteful number, since it uses less digits than its factorization.

20001180391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383250.

The product of its (nonzero) digits is 432, while the sum is 25.

Adding to 20001180391 its reverse (19308110002), we get a palindrome (39309290393).

The spelling of 20001180391 in words is "twenty billion, one million, one hundred eighty thousand, three hundred ninety-one".