20018191011 has 32 divisors (see below), whose sum is σ = 33175661568. Its totient is φ = 10454486400.

The previous prime is 20018190989. The next prime is 20018191027. The reversal of 20018191011 is 11019181002.

It is not a de Polignac number, because 20018191011 - 2¹³ = 20018182819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20018191031) 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 31 ways as a sum of consecutive naturals, for example, 335431 + ... + 390576.

It is an arithmetic number, because the mean of its divisors is an integer number (1036739424).

Almost surely, 2^20018191011 is an apocalyptic number.

20018191011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20018191011 is a deficient number, since it is larger than the sum of its proper divisors (13157470557).

20018191011 is a wasteful number, since it uses less digits than its factorization.

20018191011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726131.

The product of its (nonzero) digits is 144, while the sum is 24.

It can be divided in two parts, 200181 and 91011, that added together give a palindrome (291192).

The spelling of 20018191011 in words is "twenty billion, eighteen million, one hundred ninety-one thousand, eleven".