20730541 has 4 divisors (see below), whose sum is σ = 22325212. Its totient is φ = 19135872.

The previous prime is 20730533. The next prime is 20730551. The reversal of 20730541 is 14503702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14503702 = 2 ⋅7251851.

It can be written as a sum of positive squares in 2 ways, for example, as 10426441 + 10304100 = 3229^2 + 3210^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730541 - 2³ = 20730533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20730551) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 797316 + ... + 797341.

It is an arithmetic number, because the mean of its divisors is an integer number (5581303).

Almost surely, 2^20730541 is an apocalyptic number.

It is an amenable number.

20730541 is a deficient number, since it is larger than the sum of its proper divisors (1594671).

20730541 is a wasteful number, since it uses less digits than its factorization.

20730541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594670.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20730541 is about 4553.0803858487. The cubic root of 20730541 is about 274.7073073196.

The spelling of 20730541 in words is "twenty million, seven hundred thirty thousand, five hundred forty-one".