20511650343243 has 8 divisors (see below), whose sum is σ = 27349026138256. Its totient is φ = 13674354055200.

The previous prime is 20511650343227. The next prime is 20511650343307. The reversal of 20511650343243 is 34234305611502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20511650343243 - 2⁴ = 20511650343227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20511650342243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19272148 + ... + 20308593.

It is an arithmetic number, because the mean of its divisors is an integer number (3418628267282).

Almost surely, 2^{20511650343243} is an apocalyptic number.

20511650343243 is a deficient number, since it is larger than the sum of its proper divisors (6837375795013).

20511650343243 is a wasteful number, since it uses less digits than its factorization.

20511650343243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39753485.

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 20511650343243 its reverse (34234305611502), we get a palindrome (54745955954745).

The spelling of 20511650343243 in words is "twenty trillion, five hundred eleven billion, six hundred fifty million, three hundred forty-three thousand, two hundred forty-three".