20645755754603 has 24 divisors (see below), whose sum is σ = 25162272334752. Its totient is φ = 16590592180224.

The previous prime is 20645755754599. The next prime is 20645755754609. The reversal of 20645755754603 is 30645755754602.

It is not a de Polignac number, because 20645755754603 - 2² = 20645755754599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20645755754609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19335176 + ... + 20374997.

It is an arithmetic number, because the mean of its divisors is an integer number (1048428013948).

Almost surely, 2^{20645755754603} is an apocalyptic number.

20645755754603 is a deficient number, since it is larger than the sum of its proper divisors (4516516580149).

20645755754603 is a wasteful number, since it uses less digits than its factorization.

20645755754603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39710471 (or 39710454 counting only the distinct ones).

The product of its (nonzero) digits is 105840000, while the sum is 59.

Subtracting 20645755754603 from its reverse (30645755754602), we obtain a palindrome (9999999999999).

The spelling of 20645755754603 in words is "twenty trillion, six hundred forty-five billion, seven hundred fifty-five million, seven hundred fifty-four thousand, six hundred three".