20404440340231 has 32 divisors (see below), whose sum is σ = 21394233806400. Its totient is φ = 19442758579200.

The previous prime is 20404440340187. The next prime is 20404440340289. The reversal of 20404440340231 is 13204304440402.

It is not a de Polignac number, because 20404440340231 - 2¹⁵ = 20404440307463 is a prime.

It is a super-2 number, since 2×20404440340231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20404440340193 and 20404440340202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404440340631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1500650725 + ... + 1500664321.

It is an arithmetic number, because the mean of its divisors is an integer number (668569806450).

Almost surely, 2^{20404440340231} is an apocalyptic number.

20404440340231 is a deficient number, since it is larger than the sum of its proper divisors (989793466169).

20404440340231 is a wasteful number, since it uses less digits than its factorization.

20404440340231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17875.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 20404440340231 its reverse (13204304440402), we get a palindrome (33608744780633).

The spelling of 20404440340231 in words is "twenty trillion, four hundred four billion, four hundred forty million, three hundred forty thousand, two hundred thirty-one".