20540020042243 has 32 divisors (see below), whose sum is σ = 22519976209920. Its totient is φ = 18619359252480.

The previous prime is 20540020042169. The next prime is 20540020042273. The reversal of 20540020042243 is 34224002004502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20540020042243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20540020042273) 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, 702376380 + ... + 702405622.

It is an arithmetic number, because the mean of its divisors is an integer number (703749256560).

Almost surely, 2^{20540020042243} is an apocalyptic number.

20540020042243 is a deficient number, since it is larger than the sum of its proper divisors (1979956167677).

20540020042243 is a wasteful number, since it uses less digits than its factorization.

20540020042243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32299.

The product of its (nonzero) digits is 15360, while the sum is 28.

Adding to 20540020042243 its reverse (34224002004502), we get a palindrome (54764022046745).

The spelling of 20540020042243 in words is "twenty trillion, five hundred forty billion, twenty million, forty-two thousand, two hundred forty-three".