20534818172603 has 24 divisors (see below), whose sum is σ = 24193785487872. Its totient is φ = 17065776503664.

The previous prime is 20534818172593. The next prime is 20534818172647. The reversal of 20534818172603 is 30627181843502.

It is not a de Polignac number, because 20534818172603 - 2⁴ = 20534818172587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20534818172653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1040900 + ... + 6492542.

It is an arithmetic number, because the mean of its divisors is an integer number (1008074395328).

Almost surely, 2^{20534818172603} is an apocalyptic number.

20534818172603 is a deficient number, since it is larger than the sum of its proper divisors (3658967315269).

20534818172603 is an equidigital number, since it uses as much as digits as its factorization.

20534818172603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451911 (or 5451804 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 20534818172603 in words is "twenty trillion, five hundred thirty-four billion, eight hundred eighteen million, one hundred seventy-two thousand, six hundred three".