20707543 has 2 divisors, whose sum is σ = 20707544. Its totient is φ = 20707542.

The previous prime is 20707517. The next prime is 20707579. The reversal of 20707543 is 34570702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20707543 - 2¹⁷ = 20576471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20702543) by changing a digit.

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 as a sum of consecutive naturals, namely, 10353771 + 10353772.

It is an arithmetic number, because the mean of its divisors is an integer number (10353772).

Almost surely, 2^20707543 is an apocalyptic number.

20707543 is a deficient number, since it is larger than the sum of its proper divisors (1).

20707543 is an equidigital number, since it uses as much as digits as its factorization.

20707543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 20707543 is about 4550.5541420798. The cubic root of 20707543 is about 274.6056850105.

The spelling of 20707543 in words is "twenty million, seven hundred seven thousand, five hundred forty-three".