20431334511 has 32 divisors (see below), whose sum is σ = 34606233600. Its totient is φ = 11670492960.

The previous prime is 20431334491. The next prime is 20431334537. The reversal of 20431334511 is 11543313402.

It is a happy number.

20431334511 is a `hidden beast` number, since 2 + 0 + 4 + 313 + 345 + 1 + 1 = 666.

It is not a de Polignac number, because 20431334511 - 2⁵ = 20431334479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431334551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 498330 + ... + 537768.

It is an arithmetic number, because the mean of its divisors is an integer number (1081444800).

Almost surely, 2^20431334511 is an apocalyptic number.

20431334511 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20431334511 is a deficient number, since it is larger than the sum of its proper divisors (14174899089).

20431334511 is a wasteful number, since it uses less digits than its factorization.

20431334511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42196 (or 42190 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 20431334511 its reverse (11543313402), we get a palindrome (31974647913).

The spelling of 20431334511 in words is "twenty billion, four hundred thirty-one million, three hundred thirty-four thousand, five hundred eleven".