20543254505 has 16 divisors (see below), whose sum is σ = 24753397824. Its totient is φ = 16367083200.

The previous prime is 20543254477. The next prime is 20543254507. The reversal of 20543254505 is 50545234502.

It is not a de Polignac number, because 20543254505 - 2¹⁰ = 20543253481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20543254507) 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 15 ways as a sum of consecutive naturals, for example, 1225430 + ... + 1242080.

It is an arithmetic number, because the mean of its divisors is an integer number (1547087364).

Almost surely, 2^20543254505 is an apocalyptic number.

It is an amenable number.

20543254505 is a deficient number, since it is larger than the sum of its proper divisors (4210143319).

20543254505 is a wasteful number, since it uses less digits than its factorization.

20543254505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17656.

The product of its (nonzero) digits is 120000, while the sum is 35.

The spelling of 20543254505 in words is "twenty billion, five hundred forty-three million, two hundred fifty-four thousand, five hundred five".