20311100444431 has 16 divisors (see below), whose sum is σ = 21418440819840. Its totient is φ = 19207618434720.

The previous prime is 20311100444339. The next prime is 20311100444441. The reversal of 20311100444431 is 13444400111302.

It is a cyclic number.

It is not a de Polignac number, because 20311100444431 - 2⁷ = 20311100444303 is a prime.

It is a super-2 number, since 2×20311100444431² (a number of 27 digits) contains 22 as substring.

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 20311100444431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311100444441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29191716 + ... + 29879398.

It is an arithmetic number, because the mean of its divisors is an integer number (1338652551240).

Almost surely, 2^{20311100444431} is an apocalyptic number.

20311100444431 is a deficient number, since it is larger than the sum of its proper divisors (1107340375409).

20311100444431 is a wasteful number, since it uses less digits than its factorization.

20311100444431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690486.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 20311100444431 its reverse (13444400111302), we get a palindrome (33755500555733).

The spelling of 20311100444431 in words is "twenty trillion, three hundred eleven billion, one hundred million, four hundred forty-four thousand, four hundred thirty-one".