20543443431 has 16 divisors (see below), whose sum is σ = 31314219264. Its totient is φ = 11735388864.

The previous prime is 20543443411. The next prime is 20543443441. The reversal of 20543443431 is 13434434502.

It is not a de Polignac number, because 20543443431 - 2⁷ = 20543443303 is a prime.

It is a super-2 number, since 2×20543443431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20543443392 and 20543443401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20543443411) 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, 86550 + ... + 220403.

It is an arithmetic number, because the mean of its divisors is an integer number (1957138704).

Almost surely, 2^20543443431 is an apocalyptic number.

20543443431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20543443431 is a deficient number, since it is larger than the sum of its proper divisors (10770775833).

20543443431 is a wasteful number, since it uses less digits than its factorization.

20543443431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310150.

The product of its (nonzero) digits is 69120, while the sum is 33.

Adding to 20543443431 its reverse (13434434502), we get a palindrome (33977877933).

It can be divided in two parts, 205434 and 43431, that added together give a triangular number (248865 = T₇₀₅).

The spelling of 20543443431 in words is "twenty billion, five hundred forty-three million, four hundred forty-three thousand, four hundred thirty-one".