20553543 has 6 divisors (see below), whose sum is σ = 29688464. Its totient is φ = 13702356.

The previous prime is 20553529. The next prime is 20553557. The reversal of 20553543 is 34535502.

It is an interprime number because it is at equal distance from previous prime (20553529) and next prime (20553557).

It is not a de Polignac number, because 20553543 - 2⁶ = 20553479 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 (20553503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1141855 + ... + 1141872.

Almost surely, 2^20553543 is an apocalyptic number.

20553543 is a deficient number, since it is larger than the sum of its proper divisors (9134921).

20553543 is a wasteful number, since it uses less digits than its factorization.

20553543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283733 (or 2283730 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 27.

The square root of 20553543 is about 4533.6015484381. The cubic root of 20553543 is about 273.9232518099.

The spelling of 20553543 in words is "twenty million, five hundred fifty-three thousand, five hundred forty-three".