20545543 has 8 divisors (see below), whose sum is σ = 21354480. Its totient is φ = 19743360.

The previous prime is 20545531. The next prime is 20545573. The reversal of 20545543 is 34554502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20545543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20545573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5023 + ... + 8143.

It is an arithmetic number, because the mean of its divisors is an integer number (2669310).

Almost surely, 2^20545543 is an apocalyptic number.

20545543 is a deficient number, since it is larger than the sum of its proper divisors (808937).

20545543 is a wasteful number, since it uses less digits than its factorization.

20545543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377.

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

The square root of 20545543 is about 4532.7191618277. The cubic root of 20545543 is about 273.8877077289.

The spelling of 20545543 in words is "twenty million, five hundred forty-five thousand, five hundred forty-three".