20543545 has 16 divisors (see below), whose sum is σ = 27763200. Its totient is φ = 14457600.

The previous prime is 20543539. The next prime is 20543569. The reversal of 20543545 is 54534502.

It is not a de Polignac number, because 20543545 - 2⁷ = 20543417 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4320 + ... + 7729.

It is an arithmetic number, because the mean of its divisors is an integer number (1735200).

Almost surely, 2^20543545 is an apocalyptic number.

It is an amenable number.

20543545 is a deficient number, since it is larger than the sum of its proper divisors (7219655).

20543545 is a wasteful number, since it uses less digits than its factorization.

20543545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12096.

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 20543545 is about 4532.4987589629. The cubic root of 20543545 is about 273.8788291548.

The spelling of 20543545 in words is "twenty million, five hundred forty-three thousand, five hundred forty-five".