20603904505 has 16 divisors (see below), whose sum is σ = 26089568640. Its totient is φ = 15589307008.

The previous prime is 20603904499. The next prime is 20603904527. The reversal of 20603904505 is 50540930602.

It is a cyclic number.

It is not a de Polignac number, because 20603904505 - 2¹¹ = 20603902457 is a prime.

It is an unprimeable number.

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, 996307 + ... + 1016776.

It is an arithmetic number, because the mean of its divisors is an integer number (1630598040).

Almost surely, 2^20603904505 is an apocalyptic number.

It is an amenable number.

20603904505 is a deficient number, since it is larger than the sum of its proper divisors (5485664135).

20603904505 is a wasteful number, since it uses less digits than its factorization.

20603904505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013200.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 20603904505 in words is "twenty billion, six hundred three million, nine hundred four thousand, five hundred five".